Rogue 3/Swashbuckler 6/Unarmed Swordsage 1/Swashbuckler +10 Is a pretty decent meelee damage dealer.
If you grab daring outlaw and some way to sneak attack, Undead, Constructs and Oozes.
And also remember the Twf version of the Swashbuckler. I think it's from Drow of The Underdark, but haven't been able to find it myself.
The only thing you really need is 10 strength, loads of dex and two stabby knives of doom. And you should be set.
Or you could go the swift hunter -> dervish route.
The simplest build is still Warblade 20 though, who can both deal damage and soak a lot of damage.
EDIT: This just in, if your DM allows dragon Magazine, consider being a wild monk (from some Dragon Magazine) and grab the beaststrike feat from Dragon 355. This way you can kick ass and be a monk at the same time. You can turn into a bear, and then hit someone with flurry of blows, and deal both your unarmed damage and your natural attack damage on both all attacks. Also you are pretty SAD (Only needing Wisdom and Con).
This is a worthwhile build for one reason alone, you can play a monk, and not suck (as much as a regular monk does). Also, you'll be a kung-fu bear. Think about how awesome that is.