NGOHQ.com published a troubleshooting guide for Windows 7 Service Pack 1

A new service pack always brings some excitement, but unfortunately it also brings new issues too. Just a few days ago, Windows 7 Service Pack 1 RTM build was leaked, and there have been already reports of installation problems. Even yours truly, has encountered one. In fact, that's why Microsoft hasn't released SP1 officially yet; they are waiting for developers and OEMs to ensure drivers and 3rd party software are 100% compatible with SP1.

  How To Troubleshoot Windows 7 Service Pack 1 Installation Issues