Any Microsoft programming skills you have are marketable, so pick the one you like. Second, .Net is more than just WinForms. If you limit yourself to that, you may as well get a job flipping burgers instead.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001