:nono: not worth at all if only going just for the video function plus its video features are limiting too. go get a camcorder instead. it be money well spent than buying d90 or selling off your d80 to fund for d90.
Hi hi , if u fancy recording and photography in 1 convenience , then maybe still worth a buy for you. But do take note that the video quality will not be as good as a videocam and it will eat up your battery life fast and reduce your photography time.
Actually modern video cam are quite small and compact . For 700 and lesser you can get something decent to record video and lightweight to carry around .