I love mucking about with new technologies. At work I primarily use C# WCF, WF, WPF, WCPF (ok, I made that one up). I'm constantly improving my testing strategies and learning TDD in VS. At home I'm always working on a new project. Last month, it was using a couple NoSQL DB's in my project. (redis and mongoDB), This month, I'm comparing some of the differences between clojure and scala, in a month's time, I'll be on to something new.