Google offers spreadsheets editing in Google Docs for Mobile that that allow you to add new rows, edit existing cells, sort by columns, and filter by terms. The new editable list view is available for iPhone, iPod touch. T-Mobile G1, Nokia S60, and Symbian phones with WebKit-based browsers.
To check out these new capabilities, just go to m.google.com/docs in your mobile browser and log in. If you are a Google Apps user, go to docs.google.com/a/your-domain. Tip: If you like the list view, there's an easy way to enable it for any spreadsheet, even if you're using a desktop browser.
Just replace: http://spreadsheets.google.com/ccc?key=ID with http://spreadsheets.google.com/lv?key=ID
More info: Google Docs Blog