Roman Dzindichashvili
DVDs

I like a few of Chessbase's DVDs.
Karsten Mueller's endgame series is very good.
Daniel King's Powerplay series is excellent.
Ari Zeigler's French Repertoire, Nigel Davies' Pirc and Accelerated Dragon repertoires.
Viktor Korchnoi's Autobiographical DVDs are a hoot and quite instructive in a weird way.

Ahh yes I also liked his English DVD, Davies' updates some of Tony Kosten's "Dynamic English" suggestions and chooses some different lines as well.
With Nigel Davies, his first three DVDs for chessbase (accelerated dragon, pirc, and english opening repertoires) are really good, but the rest can be given a pass.
What are the best instructional DVDs?