Michael Robertson's ajaxLaunch has launched ajaxXLS, a web-based spreadsheet app that looks promising, and will no doubt be familiar to Excel users, but having spent a few minutes with it I can already tell ajaxXLS is far from finished. In fact, it's downright hard to use and seems like it would be infuriating to anyone trying to switch from Excel. Some of its issues might just be due to high opening day user load, but much of it just seems buggy or incomplete.