Hey Andy.

C-Sharp to VB.net Converter

http://www.kamalpatel.net/ConvertCSharp2VB.aspx

This works well. You can download the offline version which will convert more code then the online version and you even get the source code (Built in C#)

Remember though converting code is not always the best idea. For the most part everything will work but there are some things in C# which wont work in VB (From what I have read anyways someone can clear this up if I am wrong)

Regards,

Chris