Hi Senu,
Yes, I've used DVdate, and it works. It's not something I use a lot (normally I would manually add some text with the date if I needed it).
It is very simple to use. Just drop your clips onto it, click a button to add the date, and do "convert, inlay". That renders a new clip in the same DV avi format as the source clip but with the date burned in.
Doesn't work for HDV though...