Here are some recommendations from me from the top of my head. I've only listed one song from each band but most of them have a heap of good stuff if you look for it on Limewire, Kazaa etc Most of you will already know of these songs, but for those who don't what on earth you waiting for? Download them!
Dead Poetic - "Modern Morbid Prophecies"
The Used - "Take It Away"
My Vitriol - "Always Your Way"
Avenged Sevenfold - "Unholy Confessions"
Sublime - "Date Rape"
Finch - "What it is to Burn"
Deftones - "My Own Summer"
Slipknot - "Duality"
Five Iron Frenzy - "Far Far Away"
Head Automatica - "At the Speed of a Yellow Bullet"
Jeff Buckley - "So Real" (not a band I know but he's a legend
)
Minuteman - "Gave You All The Blame"
Mansun - "Railings"
Janes Addiction - "Just Because"
Senses Fail - "Lady in a Blue Dress"
Nine Inch Nails - "Closer"
Slightly Stoopid - "Jedi"
System of a Down - "Chop Suey"
Millencolin - "No Cigar"
Creed - "One"
Rx Bandits - "Infection"
Pennywise - "Alien"
Mxpx - "Responsibility"
Queens of the Stone Age - "The Lost Art Of Keeping a Secret"
Adema - "Trust"
P.O.D - "Will You"
Coyote Shivers - "Secret Jelousy"
9 Days - "If I am"
Three Days Grace - "I Hate Everything About You"
With Broken Wings - "A Beautiful Tragedy"
Neve - "Orbit"
Strata - "Never There"
Anatomy of a Ghost - "Beauty is in it's Embrace"
Fightstar - "Palahniuk's Laughter" (I know it's the dude from Busted but some of their songs are worth a listen ya know)
Incubus - "Talk Shows on Mute"
Lacuna Coil - "Stars"
Less Than Jake - "Ghosts of you and Me"
Prophecy - "Wicked Lover"
Real Big Fish - "I want your Girlfriend to be"