I've been working in conjunction with Evan Lim and Young Joo to convert the source code examples from Charles Petzold into VB.NET. As at today there still doesn't seem to be a WPF book on the market that has VB.NET as the code-behind (although I know there are a couple on the way). Add to this the fact that many C# to VB converters at the moment still get it wrong with several areas of the new Framework, this is a real stumbling block for many VB developers who would otherwise be much more interested in digging into WPF.
The link to the final version of the conversion of Petzold samples is here. You can download individual chapter code or the whole shebang from the links in that blog item
I've just started working on a similar project to convert the C# code of another WPF book. I'll post more once I've got something to show. In the meantime I hope that the Matthew McDonald and Billy Hollis WPF/VB books will be on the shelves before long.