.Net roles are definately increasing at the moment, and some are even saying that it's going to make a serious challenge to Java in the not so distant future.
VB .Net is a good one to re-tool on, but I would also look at ASP .Net (for web-based applications and web design).
.Net is probably the way forward so it can't do you any harm. What sort of work are you looking for and where are you based?