Interesting. I was interested in RB at first, partly because I didn't think I'd like the .NET Framework. However, after looking into the Framework, I find it's actually preferable for me for a lot of reasons. Besides, the latest, greatest version of RB didn't have a date picker control! I know, that's a pretty minor thing, but it just doesn't make sense that they would leave out what must be a very common control like that. I emailed them, and they happily guided me to a third party plugin that cost too much (I don't remember what that price was).
I'm pretty solidly committed to C# .NET now.