Intro riffs here are amazing!:

http://www.youtube.com/watch?v=hTitdeTTzxY&feature=fvw

AC-DC - Back In Black
http://www.youtube.com/watch?v=tXaZmY52gHM

no matter how many times I hear it I go nuts.

Ozzy Ousborne - CRAZY TRAIN
http://www.youtube.com/watch?v=JRbPWcLode0

another on ethat makes me go crazy, especially with randy Rhodes fucking amazing technique and wizardry.

"Queen of Cans and Jars" by Guided by Voices.

Seriously.

The Notwist - This room

I Wanna Be Your Dog, Teenage Riot and Sister Ray are some favorites.

black sabbath - NIB
the stooges - 1970

not all time favorite but...definately my favorite Rolling Stones riffs...



Jumping Jack Flash.

Ah, tough one!

Right now, I'm gonna say 'Slip It In' by Black Flag. The begininng of that song blows my mind.

singling out one riff out of the oceans of great ones is silly, but i'll play along:


Electric Wizard "Dunwich"

okay, i've decided that my all-time favorite riff is the opening riff to "electric funeral."

"Electricity-Captain Beefheart"

Edit: Not all time favorite, just one of them.

Loop - Collision

It´s definetely the the riff in the begin of Captain Beefheart´s Moonlight on Vermount (right after the drumbo´s amazing drum fill).

Somebody asks what is riff. I think it is something that is very often played by guitar and repeating many times. There could be just one sound at the time or chords. But normal "backchords" are not riff, in riff chords change quite fast.

some of my fav beefheart riffage is at the beginning sweet sweet bulbs and at 1/4 way into safe as milk!

fav riff at this very moment is picture book by the stinks as I've just figured it out, simple, but catchy. one of those riffs that are most naturally plucked out from the easy layout of a guitar tuned in standard.

Death Valley 69

neil young is a master with riff chords, e.g., 'been waiting for you' and 'cinnamon girl' instantly come to mind.

Bowie's "Queen Bitch"
some already mentioned
PJ Harvey O stella

loads
too many

impossible to post A fav

can't compute

**BRzZzZ...OTtt***

my fav rolling stones riff has to be 'can't you hear me knocking', right from the first time I saw 'blow' with jonny depp, well not with him of course haha

how about that end riff from The Sprawl....that's a nice sweet sounding riff.