There's a lot to learn these days (whenever isn't there a lot?) and one thing I will do for 2008 is make a list of technologies I'd like to dive into with some sense of priorities. 

Among the ASP.NET MVC, Powershell 2.0, and Iron Python (for starters) I've been interested in F#. First as a topic on Hanselminutes but I lurk on Harry Pierson's blog and he's been posting about it quite a bit.  Here are some links:

1. F# Overview on hubFS
2. From DevHawk:

Someday it is.