The main reason for the upgrade was because of row and column limits in Excel 2003 and now I have no problem opening large datafeeds. Another feature I find really useful is the drop down function list in Excel 2007 which makes it really easy to lookup functions to use in a spreadsheet.
[...] much debunk rumors that Office 2010 will only be available for 64-bit systems. I’ve just upgraded to Office 2007 not so long ago and it would be interesting to see what new features will be introduced in Office [...]