Registrations have opened up once again for the RetroChallenge 2012 Summer Challenge (in Winter). Running over the month of July, the Challenge is a loose-knit bunch of people who do many and varied things with a retro computing theme. It doesn't much matter what you do, as long as you do something, then blog about it as you go. After somewhat arbitrary judging by unseen and unnamed (and entirely partial) judges, someone wins a thing!
Don't worry if you don't have the time or resources to do something spectacular - epic failure is par for the course, and entirely expected. I've signed up, and I don't have the foggiest idea what to do
http://retrochallenge.org/
@retrochallenge on the twitters.
They're also on the Facebooks at https://www.facebook.com/groups/365044403555438/ for what it's worth.