I'd be amazed if any Dubstep Allstars compilations are on iTunes.
You can find plenty of the tracks by dubstep artists on them like Benga and Kode 9 and Coki, and Burial of course - but dubstep's like Marmite, unless you're from Croydon!
My recommendations from yesterday were based on the fact that they're on iTunes, fairly safe, and I'd just played them. By the same logic, today's recommendations:
Boards of Canada's In a Beautiful Place Out In The Country, and Soulwax's Nite Versions/Any Minute Now.