During my so called 'free time', when I probably should be cleaning out my fridge, or the toilet, I do genealogy.
I started when my son was about 2 and a half, and have been doing it ever since. I am currently working my maternal grandmother's lines, my fathers paternal and maternal lines, and my FIL's paternal lines.
Though I use Ancestry.com and a few paid sites, I find that there is still enough good free info out there for anyone to get started. Right now, my favorites are:
A newish 'Social Networking' Genealogy site. I've met some grand new folks, and worked some of my bricks loose a bit:
Family Search Record Search
I'll post more about my adventures in genealogy hunting later...got two sick kids today...its going to be a long two days. :(