Radian Labs Dubstep / DNB / Grime Soundset
 

The talented and kind people at Radian Soundlabs have released a soundset for the Virus TI os4 geared toward Dubstep, DNB and Grime production

http://www.radiansoundlab.com/2010/03/virus-ti-bank/

There are also some pretty cool Reaktor ensembles on their page.

hope this isn't a re-post, I did use the search feature before posting

cheers!