Does anyone know of a good bar/lounge in DC that has dueling pianos? If not, what about a fun piano bar? We enjoy the piano bars on cruises and found a great dueling piano bar in New Orleans. Would love to find something like that again.

No dueling pianos I can think of. A number of paino bars, including the Banana Cafe on Capitol Hill.

Would you tell us what the great duelling piano bar in NOLA is?

The name of the one we liked the best was Howl at the Moon. There is also Pat O'Briens, but it was not as much fun and it was very crowded.

If dining is going to be involved you might try "Mimi's" near Dupon Circle.
We went there (per advice on this forum) just after Christmas and had a great time. They have a piano player who plays throughout the evening and then every several minutes the wait staff perform, i.e. sing. Some are better than others but it does make a very enjoyable evening. Besides, the food is pretty good.

We went to Mimi's too on the advice of this forum and thought it was great. But as the previous poster mentioned its not a dueling pianos place.