My Dervish (Rogue 20 / Monk 10 / Fighter 10) was customized for the SoU, Nether Scrolls, HotU, Sands of Fate campaign. This is a stealthier, more general-purpose version, which unfortunately bears an even closer resemblance (still coincidental) to Monastic Commando (Rogue 19 /Monk 11/ Fighter 10). Before posting this, I changed the build to replace Rogue 20 with Monk 11, taking the advice from the discussion of my other Dervish build.
There isn't really much changed from the original Dervish. Persuade and Spot are replaced by Hide and Move Silently, and most of the points from Lore are diverted to Set Trap. Dodge is replaced by Stealthy, and Critical Strike and Improved Sneak Attack are replaced by Epic Skill Foci in Hide and Move Silently. Shift one level from Rogue to Monk and the transformation is complete.