So you may have already seen that RU1 for Ex2007 SP1 has been released:

Update Rollup 1 for Exchange Server 2007 SP1 (KB945684) has been released and is live at:

http://www.microsoft.com/downloads/details.aspx?FamilyId=C29A6AA8-CA44-43EA-A88F-7500C4BD3D31&displaylang=en

http://support.microsoft.com/?kbid=945684

But here is something fun for the weekend that's come out of Microsoft Research, HD Viewer. Make sure you spend sometime zooming, panning tilting and stuff...It's really quite amazing: http://www.msnbc.msn.com/id/22848535/