What new tech should I learn?

I'm debating what new area I should explore, assuming I have the time:

• SignalR, maybe by making the Weather Now home page auto-update?
• Python, maybe by putting together some scripts that use a new API I create for The Daily Parker?
• Bootstrap, maybe by overhauling the Inner Drive Technology corporate website?
• Raspberry Pi, maybe by making a cute little device that responds to a Weather Now API?

I'm thinking about a few side projects, obviously. And this article on new "universal remote" apps in today's Times got me thinking about home automation, too. But that's less a skill to learn than a set of toys to play with.