Tracy Cox's book SuperSex is fun and reasonably informative (but nothing mind-blowing), and makes for a great tabletop conversation piece (lots of very sensual pictures).
David Rose's Sex God Method I thought was not bad. Lots of focus on dirty talk and delaying gratification and using emotional buildup to spike sexual tension... he had the same mentors as I did early on, so the line of reasoning is somewhat similar to what you'll see on this site and you might see familiar things there.
There's an illustrated (photographs) version of the Kama Sutra floating around out there that's pretty good for when you need a change of positions. Fun to go through with lovers and girlfriends, too.
Aside from that, I realize there's not a lot up on the site here on sexual technique - that's something I intend to address in the not-too-distant future.
Chase