iRobot previews their next generation floor cleaning robot - iRobot Scooba.

The iRobot Scooba is designed to vacuum, scrub and dry hard floors automatically. iRobot partnered with The Clorox Company to develop a cleaning solution for the Scooba floor washer.
Unlike a conventional mop and bucket, the robot only uses fresh water and cleaning solution from a clean tank, so Scooba never spreads dirty water on the floor. Scooba cleans wet spills in addition to dirt and grime, and it is safe for use on all sealed hard floor surfaces, including wood and tile.
iRobot has a video and flash demo on their site explaining how the new robot mops floors.

iRobot states that only a limited number of iRobot Scooba floor washing robots will be on sale for this holiday season. Large distribution is to start in 2006.
I really would like to try the iRobot Scooba on my kitchen floor. I have high hopes that it will work, because the floor iRobot shows in the video demo looks exactly like mine.
The iRobot Roomba floorvac robot sold since 2002 1.2 million times.
More details in iRobot press-release.