SQL Server Express and .NET Framework 4

[update 1/17/2012: Fixed formatting and clarified all comments apply to all future Service Packs of SQL Server 2008 Express and SQL Server 2008 R2 Express] [update 4/28/2010: All comments in this post apply to .NET Framework 4 RTM and to SQL Server 2008 R2 Express] We have just shipped a new package of SQL Server 2008…