What I have usually called "drak rave" has kind of merged or become what the guys I work with call dubstep. I've been very glad for these guys getting me to look deeper into this facet of dance music...but here are the more mainstream songs right now...
Usually around 140bpm in tempo, the unifying sounds within dubstep are always bass and sub-bass.
The music ranges in style from melodious instrumentals to dark, techy and distorted numbers.
Many UK grime mc's also mc over dubstep tracks, although grime and dubstep should not be confused.
Dubstep is usually mellow and generally has a well paced structure to each song. Grime beats are generally more disjointed, the overall production level being grittier than that in dubstep. from Urban dictionary
Dubstep is a genre of electronic dance music that originated in South London, United Kingdom. Its overall sound has been described as "tightly coiled productions with overwhelming bass lines and reverberant drum patterns, clipped samples, and occasional vocals".[
The earliest dubstep releases date back to 1998 and were darker, more experimental, instrumental dub remixes of 2-step garage tracks attempting to incorporate the funky elements of breakbeat, or the dark elements of drum and bass into 2-step, which featured B-sides of single releases. In 2001, this and other strains of dark garage music began to be showcased and promoted at London's night club Plastic People, at the "Forward" night (sometimes stylized as FWD>>), which went on to be considerably influential to the development of dubstep. The term "dubstep" in reference to a genre of music began to be used by around 2002, by which time stylistic trends used in creating these remixes started to become more noticeable and distinct from 2-step and grime. It was labels Big Apple, Amunition and Tempa that began circulating the "dubstep" term. From Wiki
The above song is probably one of the most popular and most heard versions of a dubstep piece.
and here are Skrillex and Deadmaus