http://modelmaniadvd.com/

Back in the day when Garage Kits ruled my world I used to draw inspiration from David Fisher,

I had Volume 1 and 2 on video and they were great. It is now on 2 DVD's, each with 3 Volumes!!!

Highly recommend them, you wont get transformers but with the first disc you will see his approach to:

Mixing paint

Base coating

Airbrushing tones (not just shadows of a dark color around everything)

Drybrushing tones (not making everything look like is belongs in “Geeks-Workshop”)

Metal effects (Not just drybrusing sliver on black, seriously people!!)

Washes, painting detail, textures, weathering.
Masking (With Latex, best ever!!)

and lots of other stuff buy it!!!