Originally Posted by arbscht
A couple I've come across are the Thomson Elite setback seatposts and the Titec El Norte. I was investigating them to adjust my fit as well (got the seat right back), but decided to go with a longer straight seatpost, as legot73 says, with maybe a bit of layback.
I have a Titec, although when I bought it, it was called the Hellbent. It has lots of setback but it also puts lots of strain on the seat tube/top tube junction. My bike had an extended seat tube (about 1.5" higher than the top tube) and it broke because of the extra stress. And this bike wasn't one that I rode hard. No jumps or off-roading, just riding back and forth to work.
Probably not a good idea unless you have a stout frame.