Im a fan of both Rock and Metal and all there little sub genres (i.e. Ska,Nu,Emu,Punk etc etc)
Here are a few:
Adema,A,Alien Ant Farm,Audioslave,Ash,American Head Charge,Avril Lavigne,Bad Religon,Blink 182,Crazytown (post butterfly),Drowning Pool,Feeder,Finch,Foo Fighters,Glass Jaw,Goldfinger,Good Charllote (sp),Hell is for Heroes,The Hives,The Kennedy Soundtrack,Inme,Metallica,Puddle of Mudd,Bowling For Soup,Linkin Park,Limp Bizkit,The Wildhearts,Hawkwind,Iron Maiden,Reel Big Fish,Coal Chamber,NERD,Lost Prophets,Creed,POD,Evanescence,The White Stripes,The Cardigans,Basement Jaxx,Static-X,Primal Scream,Muse,Nickleback,SOAD,RHCP,Alanis Morrisette,U2,Placebo,SUM 41,Feeder,Taproot,Violent Delight,Something Corporate,Alkaline Trio,The Transplants,Hot Action Cop,Black Sabbath,Korn,The Vandals,Harry,Mad Capsule Market,Electric Six,Blood Hound Gang,Queens Of The Stone Age,The Androids,AFI,Wheezer,Incubus,The Strokes,Jimmy Eat World,Teenage FBI,Front Left Tire,ZWAN,Tenacious D and of course Nirvana.