Service Pack 2 for Office System 2007 and Office Server 2007 has been released on April 28th.

For more details on what is in the Service Pack 2 could be found here:

• Description of WSS 3.0 SP2
• Description of MOSS 2007 SP2
• Description of SharePoint Designer 2007 SP2

More information could also be found at Updates Resource Center for SharePoint Products & Technologies

There is no media for the SP2, below are the links to download the binaries:

• WSS 3.0 SP2
• MOSS 2007 SP2
• SharePoint Designer 2007 SP2