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Curse.com is probably the best place to get mods. You can download the Curse Client (which I'm pretty sure is what Fell's talking about) to install them and keep track of updates for them.
If you're healing, Grid's a pretty popular and overall great addon to have (once you figure out how to configure it to your needs). The addon Clique goes pretty well with Grid for mouseover healing and dispelling.
If you're tanking, I think TidyPlates can come in handy. It's pretty much customizable name plates that can be helpful for aggro purposes.
Can someone help me remember a good site to get current mods from? Also, maybe help me remember which ones to get. I looked back through old files and saw that I used to use:
Titan Panel
Decursive
Auctioneer
Gatherer
and a few others.
Does anyone know if those are still being kept current? Or are there better mods to go after now (I'm sure there are).?