Currently it's synthesizers; I've been downloading a bunch of software, and soon I'll hopefully have the software mostly figured out and I'll be able to start making songs. This has been pretty fun whether or not it ends up working out. Another current obsession is lockpicking; once I get home from school for fall break I'll make my own lockpicks (already found templates) and practice a lot more.
A major obsession for the past year-and-a-half has been Pokémon; it was a huge obsession for me from 8-10 back when I still gave people huge lectures on my interests, and I'm just as excited for the new Pokémon coming out next month as I was ten years ago.
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I'm never gonna dance again, Aspie feet have got no rhythm.