Office 2007 Intentions
I've been using the Office 2007 beta for a few months now. I intend to upgrade (from 2003) as soon as I can afford it, for my home computer. I seriously doubt we'll upgrade any time soon at work, since there's no money available to budget for it.
As far as features for Office 2007, I find the Outlook features significantly less compelling than the Excel and Word interface changes. The new ribbons (as opposed to the prior menus) are a big improvement. Much faster to get to the controls and features I need, compared to prior versions.
A lot of that could be built using custom menu bars and some VBA, but to me it's worth the cash for an upgrade as compared to the time to build such an interface for myself.
The behind-the-scenes stuff (XML file format, etc.) doesn't currently matter much to me, so I don't really have an opinion on it.
I have to say though that I prefer Access 2003 over Access 2007 so far. I use Access as a front-end for SQL databases at work, and it gets a LOT of work. I don't find the new Access interface useful to me. For someone writing an actual Access database, without any major VBA, it might be nice, but for me, it's less useful than the prior version.