I noticed you don’t have sheetster listed in your post. It’s another online spreadsheet that I’ve been personally using because it has some features that google spreadsheets doesn’t have like an integrated blog and the ability to subscribe to cells as RSS feeds.

But with google’s incorporation of irows and acquisition of jotspot, who knows where online spreadsheets will go from here. I like the list you compiled above and it was great seeing what all these different companies are up to. Thanks!