The first Saturday in May every year. The day when nerds everywhere can gorge themselves at the trough of freedom (free-comics-dom?). Here's the official website.I got a Thor one, a Spider-man, a comic by Mike Mignola (of Hellboy fame), a Green Lantern, and a Dark Crystal one. It appeals to my nerdish leanings AND my love of free things! Good stuff!
p.s. Cap'n McShanty points if you got the Simpson's reference!