Grab sets off of Rinse FM's blog, tons of good stuff. Also, Headhunter drops some studio mixes from time to time. Best bet is to check out www.dubstepforum.com for more.
Dubstep is not that big in the DC area, even though we have Joe Nice just up 95 in Baltimore, mainly a bunch of drum'n'bass Djs that got in to this. Distance and maybe Juju are playing here in May though. I did a mix for the internet show I'm a part of, and we have two residents on the show that are mainly playing dubstep. Go to www.expansionbroadcast.com to check that out.
And aside from SLUSHIE's list, I'm really in to Distance, DJG, Dubchild, Elemental and Reso.