Office 2007 SP1..

… is now ready for download. You can also get Visio 2007 and Project 2007 service packs too.

Office 2007 SP1 may require a reboot, presumably dependant upon version is installed, but Visio and project do not.

 http://office.microsoft.com/en-us/downloads/FX101321101033.aspx

You can choose to wait for them to appear in WU, of course..