I am currently learning Scala and CoffeeScript.
For work I use primarily ASP.NET MVC, Knockout and SQL Server, while developing hobby projects using WPF, WCF, NHibernate and FubuMVC.
I'm trying to devote time to open source, namely I contribute to Fluent NHibernate, StructureMap and FubuMVC projects plus several of my own ones.
I am very much interested in software development practices and techniques, like unit and acceptance testing, TDD, extreme programming practices like SCRUM.
My source control system of choice is Git, hence I use Mercurial for work