I know, I know. This post is kind of a copout, but hey, I'm wrapping up a decent amount of my sketch cards right now, and haven't had much time to dig up some new content for you guys. BUT, each of the following links contain a lot of great info you may have missed from industry artists and I highly suggest you revisit them for some solid advice!
Kate Cook's Advice
Interview with Grant Gould
Interview with David Fernandez
Interview with Randy Martinez
Interview with Denise Vasquez Part I & Part II
Will try to get some new stuff up soon! =D