A few more have come to mind after reading all the replies.
Nickelback. People are hard on them a lot, but I think some of their stuff is really good.
Carole King and James Taylor. Generally not a popular band among teenagers my age :p
AFI and Three Days Grace. For the goth in me :p. Although neither of these are really that embarrassing, both of their most recent albums are great.
Lamb of God. Once again not a metal-head, but I think Chris Adler is a beast, and the guitars riffs are awesome too. Listen to the intro for redneck, and you'll know what I mean. Not a fan of the screaming vocals though.
Billy Idol. Once again people are hard on him a lot. I think he's got outstanding talent though.
Fall Out Boy. Most people either like em or hate em. I think lots of their stuff is really good.
The last one is a song by another metal band, In Flames. I only have one song by them, called crawl through knives (not the most pleasant title, i know.). That intro riff, oh man. One of the sickest guitar riffs I've ever heard. Chorus is good too. If you're a fan of awesome guitar riffs, you won't be disappointed. http://www.youtube.com/watch?v=GhE_UUeDNLw