BabbelFisken
In today's devx newsletter, in an article-short entitled "Convert Code from VB.NET to C#", Marco Bellinaso identifies a couple of available services for converting C# code to VB. He says, however, that he is unaware of any tools that perform the reverse translation (from VB to C#), and then goes on to describe a workaround process for doing this that uses Anakrino.
A couple of months ago, someone (I think it was Chris Sells) pointed me to an open source utility called BabbelFisken that does exactly this. In fact, BabbelFisken also converts from Classic VB to C#, from Delphi to C#, and from Turbo Pascal 5 to C#!
Source code (C#) included. Check it out.