Check out some of the new Scandinavian bands.
The HELLACOPTERS and GLUCIFER are awesome guitar rock bands in the tradition of MC5, Blue Cheer and the Stooges.
TURBONEGRO mixes Alice Cooper, punk, glam and metal with faux homo-nazi-sailor imagry and makes some of the most ass kicking guitar rock EVER.
THEE MICHELLE GUN ELEPHANT is a cool band from Japan who have a sound all their own.
As for American bands, you HAVE to check out ELECTRIC FRANKENSTEIN, possibly the greatest american band ever. Check out The Supersuckers and Murder City Devils too.
A good series of modern guitar rock is the FISTFUL of ROCK N ROLL comps put out by Sal of ELECTRIC FRANKENSTEIN on various lables.
As for the Classics, You cant forget about THE STOOGES, MC5, THE DICTATORS and the NEW YORK DOLLS.
The Dictators (whose guitar player also was a founding member of the mighty MAN O WAR) have a great new album out called DFFD, and its as great and heavier than anything they’ve done since 1975. This band is one of those unknown American treasures. The singer owns a bar, MANITOBAS in NYC. Check it out if your ever there.
While you won’t hear any of these bands on your local classic rock stations (they only have a playlist of like 20 songs) Most of these bands would be more than happy for you to check out their music through various ways that are frowned upon on this forum, and Electric Frankenstein has TONS of MP3s available for free at http://artists.mp3s.com/artists/11/electric_frankenstein.html
Jon