I posted a bit of a rant on Microsoft's SQL Server forums after finding out they have no intention of releasing a bootstrapper for SQL Server 2008 R2. This means that in Visual Studio, there is no way to add R2 as a prerequisite when building an installation routine. Even Visual Studio 2010 only supports SQL Server 2008 SP1, since that was the version of SQL shipping at the time VS 2010 came out.