As our roadmap for 2.5 says, we currently include experimental support for
VB.NET in ReSharper.
The support is currently "read-only" (navigation, search, code insight, but
no refactorings or completion;
see roadmap at http://www.jetbrains.net/confluence/display/ReSharper/ReSharper2.5Roadmap)
If you have a mixed C#/VB project we would appreciate if you give it a try
and share your opinion with us.
Thanks in advance,
Senior Software Developer
"Develop With Pleasure!"