I hadn't exactly been waiting in eager anticipation of the release of Office 2007 Beta 2 Technical Refresh, as I was under the impression that it was a minor update being released purely for compatability with Vista RC1. But John emailed the download link to me on Friday morning, and I duly installed it, and I have to say, I'm glad I did. There have been a shedload of UI improvements, and the whole suite feels much more stable (by which I mean that Outlook doesn't crash on me half a dozen times a day any more).
If you're running the beta 2 release, I'd certainly recommend installing this update.
You'll also want to grab yourself an updated copy of Windows Desktop Search while you're at it, and the Save As PDF add-in which (thanks to Adobe's lawyers), can no longer be included out of the box.
Oh, and if, like me, you're running Norton Antivirus, you'll probably have to disable its Office Plug-in, or face being unable to open any Office documents!