Office 2007 is a bit unusual, for me. Been using it for a while (since it became available to Indiana University’s community) and have been enjoying some of the features. Still don’t really enjoy the “tape” interface in Word or PowerPoint but some things seem to have been planned pretty carefully.
For instance, I’m currently writing this in OneNote which seems greatly improved over OneNote 2003. Zoho Notebook seems simpler to use (and, obviously, will be available at no cost) but OneNote is sufficiently better from previous incarnations that it is conceivably a cool tool.