addons

(normally, i would say dont ever install a addon that has a executable file, however i am aware of the irony my first link is a bundle of addons with installer)


auctioneer a great tool when you ever use the auction house (dont we all ?)

crowbar when you pickup boxes/clams/bags/etc that you can open you get a nifty icon so you dont have to search your bags for it, then open it from there

autoprofit
one button to sell all the gray items in your bag on the vendor window :)

loooads more .. but ill keep it like this for now

the raiding people will already know about damage and threat meters ;)

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couple of big addon sites

http://files.wowace.com/index.html

http://www.curse.com/

both released a way that you can run a program and it will scan your addons to make sure you have the latest known version :)

there are several other big ones