I was able to hack a bit at StupidSheet this morning, and there are some real advances.
In fact, it's a barely functional spreadsheet already! Hell, it has at least one feature OOcalc lacks, and one both OOcalc and KSpread missed.
Check it out in this video (9.5MB):
Sorry, dead file
Sorry if the audio is out of sync and/or too low. And you probably can't stream it, you need to download it first. And maybe it will 404 on you. If that's the case, wait a few minutes and insist.