Check out the record label Southern Lord. Its been said that half their roster is basically indebted to The Melvins. They're essentially all metal (sludge, drone, stonerisssshh) bands. Riff worshipers indeed.
I like Southern Lord a lot. Then again, I enjoy sludge and drone quite a bit...Boris is awesome.
Dopethrone is quite the album, full of awesome references towards shit like Lovecraft and Conan the Barbarian.
back on topic though, I still haven't found a band that could touch my toodles like Fugazi does. Some dumb people suggested that I listen to Modest Mouse (which I already do) in relation to my Fugazi interest, but that's retarded and they're absolutely nothing alike.
needs dat vocal synergy between two people and dat funk omg dat punk funk