My desktop is so cluttered with stuff that I can hardly see the background at all. Of course I could always go for the transparent theme, but all I'd really want is semi-transparent applets, not to lose the title bar, etc. I'll have to give that theme a try.

I think aiming for an update frequency for the desktop background would be less work and give enough flexibility, rather than having it understand html (/me thinks of Windows Active Desktop bloat). It would also be nice if the desktop background supported animated GIFs. No real use, but it might look nice