Google Spreadsheets gains filtering, one more reason not to use Excel
Filtering allows you to instantly deep dive into both large or small amounts of data in ways which would take hours if done manually. Google's added pretty comprehensive filtering that mimics what's available in Excel. You can filter by row or column, by multiple keywords, or partial search terms, all indicated on the spreadsheet by green highlights. Add this to the existing sorting function of Spreadsheets and you've got yet another reason to use the light cloud-based Google Docs over the juggernaut that is Microsoft Office.