Do you ever wonder what reference a person who works on the VB product uses?  For myself, I love the work Francesco Balena did in his Programming Microsoft Visual Basic.NET book.  I got to meet Francesco while I was in Italy doing a VB tour.  I got the 2005 edition of his book (Programming Microsoft Visual Basic 2005:The Language) which is also fantastic.  The breadth and depth of his books make them one-stop shopping for me, in many cases.

I also like to use Paul Vick's The Visual Basic .NET Programming Language.  Paul wrote our language spec and his book is another one that I keep in close reach.