http://www.curse-gaming.com/mod.php -
good mod site with over 200 mods
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http://www.wowaddons.com/download.php?view.54 -
pet feeder
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http://mavra.perilith.com/%7Eveldrin/wow/SmartPet-1.3.zip -
smartpet
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http://www.fukt.bth.se/~k/wow/scripts/LootDestroyer/ -
loot destroyer
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http://www.wowaddons.com/download.php?view.65 -
context pet buttons
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http://www.home.no/gramner/wow/interface/questdifficulty_v11.zip - 
Screenshot:
http://www.home.no/gramner/wow/interface/questdifficulty.jpg
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MessageBrowers allows you to toggle between the last 5 chat messages you have typed. This is really useful if you need to retype something or if you sent a message to the wrong person for example.
Press Shift+Tab to toggle between messages.

Download here:http://www.home.no/gramner/wow/interface/messagebrowser_v14.zip
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Auctioneer - shows the prise of item from Auction House requires Lootlink
screen: http://www.curse-gaming.com/modscreens.php?id=101
link: http://www.curse-gaming.com/mod.php?downid=332

bag status meter - small bar which shows us usage of our bags *movable
screens: http://www.curse-gaming.com/modscreens.php?id=170
http://www.curse-gaming.com/modscreens.php?id=193
http://www.curse-gaming.com/modscreens.php?id=191
http://www.curse-gaming.com/modscreens.php?id=192
link: http://www.curse-gaming.com/mod.php?downid=289

bc actionbardrag - great mod lock/unlock actionbars so you can't translocate spell/abilities after you unlock it.
link: http://www.curse-gaming.com/mod.php?downid=13

buffTimers - shows time of buffs
screen: http://img92.exs.cx/img92/4052/buff6cq.jpg
link: http://www.curse-gaming.com/mod.php?downid=106

Clock - shows current time and few additional options *movable
link: http://www.warcraftdatabase.net/UI/Clock-1.2.1-u1.zip

CustomTooltip - give us some more informations about mobs NPCs and players in tooltips
link: http://www.arcanesanctum.com/nextlevel/download/CustomTooltip.zip

Flexbar - great mod - fully movable/groupable/hidable/lockable additional action bars!!
screens: before http://www.curse-gaming.com/modscreens.php?id=32
after: http://img154.exs.cx/img154/2084/wowscrnshot0114052057414yw.jpg
link: http://therealorang.com/download/FlexBar.zip

Gypsy Shell - main menu for all gypsy modes
link: http://gypsymod.the-mad.net/download/release/Gypsy_Shell.zip

Gypsy Unitbars - change view of uor and party bars *movable
link: http://gypsymod.the-mad.net/download/release/Gypsy_UnitBars.zip

Itembuff - shows time and effect of our item buffs *movable
screen: http://www.curse-gaming.com/modscreens.php?id=77
link: http://www.warcraftdatabase.net/UI/ItemBuff-1.2.1-u2.zip

Lootlink - databese of all items we've looted
screen: http://www.curse-gaming.com/modscreens.php?id=94
link: http://www.warcraftdatabase.net/UI/LootLink-1.2.1.zip

MapNotes - we can create notes at map
screens: http://www.curse-gaming.com/modscreens.php?id=117
http://www.curse-gaming.com/modscreens.php?id=115
http://www.curse-gaming.com/modscreens.php?id=114
link: http://rapidshare.de/files-en/254002/MapNotes_0.5.3.zip.html

MovableBags- allow us to move bags

QuestHistory - tells us history of our qsts we have done and give some information about them
screen: http://www.curse-gaming.com/modscreens.php?id=205
link: http://rapidshare.de/files-en/314365/QuestHistory_1_2_1.zip.html

QuestMinon - small bar which give us information about our qsts *movable
screen: http://www.curse-gaming.com/modscreens.php?id=95
link: http://www.curse-gaming.com/mod.php?downid=149

QuickLoot - pretty usefull, looting is really faster with it
link: http://www.warcraftdatabase.net/UI/QuickLoot-1.2.1.zip

SCT - shows dmg we receive above our heads
screens: http://www.curse-gaming.com/modscreens.php?id=217
http://www.curse-gaming.com/modscreens.php?id=233
http://www.curse-gaming.com/modscreens.php?id=216
link: http://www.curse-gaming.com/mod.php?downid=356

tooltipplacer - allow us to place tooltip on avery place
link: http://www.curse-gaming.com/mod.php?downid=284

SCREENSHOTS
http://img144.exs.cx/img144/2498/wowscrnshot0111050057242jt.jpg
i'll add more screenshots after my admin wi'll restore my server.
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WoW Interface: http://www.wowinterface.com/
The more we start using it the faster it can grow into the UI Mod hub it was for EverQuest for so long.
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CT_PetHealth - Shows Party Pet's HP.

Info:

CT_PetHealth v. 1.0

Download: http://wow.warcraftstrategy.com/ctmod/CT_PetHealth/CT_PetHealth.zip
Screenshots:
http://wow.warcraftstrategy.com/ctmod/CT_PetHealth1.jpg
http://wow.warcraftstrategy.com/ctmod/CT_PetHealth2.jpg
http://wow.warcraftstrategy.com/ctmod/CT_PetHealth3.jpg

CT_PetHealth allows you to view your party member's pets as if they were group members. The AddOn is very simple to use and does not require the other person to be using it.

To install, copy the CT_PetHealth folder into your AddOns directory.

When a warlock or hunter joins your group, their pet will automatically be added if they have one up; if they don't, it will appear on summon. If at any time the pet does not show up correctly, click the PetRefresh button in the upper left above your group members names or type /ph refresh. The refresh button can be hidden by typing /ph hide or shown with /ph show. If a pet ever shows as 'Unknown Entity' simply right click and update now on the pet icon.

Once the pet's hp bar shows up (it is fully movable by clicking and dragging the button to the upper left of the portrait), right click on the portrait and select Set HP. At this point you will need to ask the pet owner his or her pets max hp. Enter the max hp and hit OK, then it will refresh and the bar will turn green. If it doesn't immediately turn green, simply select the pet to make it update. If the bar shows red, this means it's not updating. If the pet gets buffed, you'll need to update its max hp.

**NOTE** Warlock imps that use phase shift have a very high chance to display incorrectly or not at all. There is no way around this.

The first pet in group is targetable via F6 by default, the second pet F7 by default. Both options can be changed via the KeyBindings menu.

The pet refresh icon is in the upper left corner by default; left clicking updates pets, right clicking & dragging allows you to move it wherever you'd like.

Quick Instructions (for those who don't like to read):

Well that was all Mod's I could find for the moment, please post more links+descriptions of Mods in this forum, thanks.