Slipknot's good. Not one of my favorites but I like them.
My two all-time favorite bands are Simple Plan and Papa Roach, but at the moment my favorite band is All Time Low. Not only is their music awesome and catchy, but they are absolutely hilarious! I've been addicted to watching footage of their concerts on YouTube the past few months. It's gotten to where I have audio from their Buzznet vids on my iPod. They make my life... like, really. xD haha Not to mention they're young(Alex and Rian just turned 22 in December) and they're all quite cute.

But seriously, go check out how funny these guys are:
http://www.youtube.com/view_play_list?p=AFDC81C94AF74934(note: their humor is very, eh, crude... but yeah, if you don't like cussing and crude/rude/socially unnaceptable humor, don't watch them. if you're okay with that stuff, then watch them, because these guys are hilarious)
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< Clickeh, please?