I have used the Dazzle usb DCV-80 with fair results.
Recently purchased an ATI Radeon 7500 All-in-wonder 64 mb AGP video card which works very well.
I'd advise getting a 2nd hard drive for your computer 7200rpms and 8 mb cache and using this drive to copy your video to.
Here is an example using the Dazzle usb of a guy getting his lips sewn together.
It is about 50 MBs so dial up users beforwarned.