Last.fm
Plus: Their artist recommendation system is generally really accurate
Minus: Their event recommendation system is horrible. It misses a lot of events that I'd be interested in(like the mountain goats for example. They're only my third most played artist over the last 12 months akudood; ) while simultaneously suggesting events for bands I've never heard of solely because they are similar to an artist I might have 20 plays of in my library.
GBAtemp
Plus: Very quick to get new nds release info and stuff, tons of great members who are helpful when you have problems and stuff. Very good active IRC channel as well
Minus: Too many foreign members and the moderators can be annoying.
ImageHost.org
Pros: small, quick, not loaded down with shit-tons of ads and bullshit like Imageshack or Photobucket, gallery feature using your browser's cookies is a nice pseudo-account
Cons: can't upload video like you can on Photobucket, can't create a permanent account, can't upload directly from URLs (this is my biggest concern)
But overall it's the current best image uploader if you ask me.
boyah
pros: ??
cons:jmv
Youtube
Pros: Yay vidz
Cons: Google