here is the client-side grid widget script, which I hope might be useful for somebody:
Should work on IE5.5+ and recent Mozilla clones.
Download size ~30K
Open source (GPL license)
Not released yet, no API documentation (will be soon)
Basically the question is - does it make sense at all? What's your current experience with client-side widgets - too slow, too heavy or there is still a place for things like that?