Well, the AT is piled highest with cheesy goodness, of course.
Assassin, dungeon delver (S&S), shadowdancer, and spymaster (S&S) are all great, depending on what your specialty is. My personal preference is for either dungeon delver or spymaster; the latter is great if you want to be the ultimate undetectable sneak, the former has the uber-rogue-friendly ability of blindsight. (In combination with sneak attack and a wand of deeper darkness, this gets just insane.)
To be honest, though, I don't really think the rogue needs PrCs. A level or two of shadowdancer is nice for the HiPS ability, and dungeon delver is nice for the blindsight, but the rogue is so diverse already due to his skill options that I think further subspecialization just isn't necessary.