I downgraded from Office 2007 back to Office 2000. Couldn't find a single compelling reason to keep it.
My biggest reason for keeping 2007 is the axing of the 65k row limit in Excel. For certain things I do, that was making it unnecessarily complicated.
I should mention that if any of you who revert back to Office 2000 use Outlook, you're also limited in your PST file size. 2003 raised the usable size from 2GB to 10GB, and 2010 raised it again to 50GB. So whatever you do, don't let it get over that limit
