Experienced tutorial meister Rob Jones starts a series of missives into Massive - Native Instruments de-facto Dubstep synthesizer - it does way more of course. This is a taster of the full course available from Music-Courses.com.
The full course runs to 2hrs and 43 mins and comes with accompanying files. Seems reasonably priced at £24 too.
Kontakt based hybrid library combines instruments with synths
A mix of features from both East and West