No, this isn't explicitly related to Linux, but Linux and Unix are what I want to focus on in my life. Given that, I would appreciate your advice, as I respect a great number of you. In addition to the poll, feel free to comment.
How useful is VB.NET?
Quite useful--take it.
You'll learn programming basics, but not much more.
I would avoid it if I were you.
Don't even think about it.