Last night, I got an invitation to try Google Spreadsheets. Overall, I'm impressed. The look and feel is very similar to Excel. One thing that I sent in a suggestion on was the lack of tooltips. When I'm in Excel and I'm not familiar with the formula I'm using, Excel will give me some hints on how to use the formula. Google Spreadsheets does not. I hope that Google adds this feature later on.
When somebody I know gets their invite for the application, I look forward to trying out the shared spreadsheet functionality.
