spreadsheets online anyone?

So it looks like Google are invading the Microsoft space once again with their new online spreadsheet application.

Check out the tour

Some points that interest me are:

Upload your spreadsheet files. Upload spreadsheets or worksheets from CSV or XLS format - all your formulas and formatting will come across intact.

Edit with others in real time. Multiple people can edit or view your spreadsheet at the same time as you - their names will appear in an on-screen chat window.

Easily save and export copies. You can save your spreadsheets to your own computer in CSV, XLS and HTML formats.

Depending on how open this goes I think there's could be scope to include this within online applications.