Scale Modelling
One of my favorite hobbies is building scale models, mostly of WWII and later military aircraft. I also like to build models related to space exploration, dinosaurs, and kits based on TV and movie properties.
I maintain my database of kits using Scalemates.com, an invaluable resource for modellers of all kinds. They have the history and information about virtually every kit every made as well as after-market parts, videos, where to buy stuff, and galleries of user projects.