Most of the Planet Mu released stuff is tangential to either genre, which may be why it's more interesting to those who aren't convinced by dubstep or grime proper. That Distance stuff is like half-metal, half-dubstep. Bizarre.
I don't like any of it very much, but I keep track of dubstep because I keep thinking I really ought to like it - I love where it came from, UK garage, and so on, plus dub, plus moody electronica, but I just find the reality about as boring as possible. The vein Hyperdub are pushing - Burial, Kode 9, et al - is by all accounts of friends in London also pretty tangential to what's being played in clubs. Still, it's not bad.
Quite like the recent Soul Jazz Records comp, Box of Dub. It's basically 90s style digi-dub for the most part, but features DMZ and Skream and so on.
There's supposed to be a remix album of (nerdy German dubbed out electronica producer) Pole's stuff in the works that's reworks by dubstep producers.
I think the only 2nd-gen dubstep tune I genuinely love is DMZ's Anti-War Dub. Crikey.