Advice on Vb.net 2003 books

I've just finished Sam's learn Vb.net 2003 in 21 days and it was a great beginner book. I'm now looking to get a good intermediate book that expands on OOP and goes more into stuff like multithreading. Does anyone have any suggestions for a good book that's out there? Thanks in advance.

I suggest you get Wrox's Professional VB.NET 2003, which will give you better knowledge of all the concepts. After that, you can go for a specializer book on multithreading, reflection, ado.net or any topic that you may want.