A few days back, David posted the tantalizing news about DocSyncer, which syncs your Microsoft Office documents with Google Docs. Alas, the service was in private beta testing at the time, meaning you had to request an invitation. As of today, however, DocSyncer has reached public beta status, meaning anyone with an e-mail address (and Google Docs account, natch) can have at it.
DocSyncer supports a wide variety of file types, including Word, Excel, PowerPoint, RTF, HTML, and OpenOffice. (I didn't find out about the OpenOffice support, which isn't mentioned anywhere on DocSyncer's home page, until just now. Kinda kills the need for the OpenOffice.org2GoogleDocs extension I mentioned the other day.)
Unfortunately, during this beta phase, only your Desktop and My Documents folders can be synced. I keep the bulk of my Office files elsewhere, so I can't yet take full advantage of DocSyncer. That's a shame, because I'm really excited about this service. In fact, I'll be surprised if Google doesn't buy it outright, as it has the potential to take Google Docs to the next level.