The SW21 also features a 0.6-second quick-start recording option and a Web mode that when combined with the included VideoCam Suite software allows you to "seamlessly" upload your video to sharing sites such as YouTube.
I reviewed the previous version, the SW20, and wasn't all that impressed with its video quality. But, there aren't a lot of options out there that have its advantages of small size, easy operation, and rugged body. It's definitely a niche product, but its a larger niche than most.
Look for SDR-SW21 in April 2009 for a little less than $400 and in three color options: lime green, orange, and silver.