Computers, mainly. Right now I've been tinkering with my laptop, replacing Linux Mint 16 (cinnamon) with Linux Lite 2.0 (and Win 7 on a different partition). My closet contains a couple of other desktops, along with an Eee PC and an old (1998) Powerbook. No idea if I'll ever do anything with them.
Photography is another big one for me. I shoot a lowly old Canon EOS-300D, but I love seeing what I can do with it. I also have a nice little collection of vintage gear, including (but not limited to) a very neat
Kodak Instamatic X45.
Bicycling, walking, reading, foruming.
I also have a small collection of HO scale locomotives and rolling stock that need some track to roll on. Hopefully I can come up with a decent plan and start on that in the near future.