The current downloadable version of NI-VISA (3.6) does include the .NET 2.0 Assemblies, but the downloadable version of NI-488.2 (2.43) does not.
If you have access to the National Instruments Driver CD, it contains the .NET 2.0 Assemblies for NI-488.2.
Please let me know if you have any further questions,
Jason S.
National Instruments