System Center Configuration Manager 2007 with Service Pack 2 is now available
The Service Pack 2 for Configuration Manager 2007 has been out for awhile now but so far is only available as an upgrade. The best you could have done was to install Configuration Manager 2007 with SP1 and then download the SP2 upgrade and apply that Service Pack. Microsoft just released the slipstreamed version of Configuration Manager 2007 SP2. TechNet and MSDN subscribers can download it from the website. It was available since the 12th of March 2010. TechNet subscribers go here. You need to log in though.