The .NET Compact Framework v2 SP1 patch can now be downloaded from MSDN. You can get to the download here, and a good Blog entry from the .NET CF team that has plenty of juicy details, here.

Added Features:

  • Added support for WindowsCE 4.2 in both the CAB
    installation and a Platform Builder Update (For more information on the
    Platform Builder Update, see
    Windows CE Download Center.)
  • Added the option to install the  global assembly
    cache to the storage card.
  • Allow DataGrid cell drawing to be overridden
  • Added support for headless Windows CE 5.0 devices
    by adding a Headless catalog item in Platform Builder. (For more
    information on the Platform Builder Update, see
    Windows CE Download Center.)
  • Added System SR files to the Windows CE 5.0
    Platform Builder catalog item.  (For more information on the Platform
    Builder Update, see
    Windows CE Download Center)
  • Enabled device debugging using mdbg.
  • Included LogViewer tools to monitor network
    traffic.
  • Included the .NET Compact Framework Remote
    Performance Monitor. (For more information, see Steven Pratschner’s
    BLOG.)
  • Added the Serializable attribute