One of the cool things about having a 5-year-old is that they're very pliable still, and like the things you like. Peter doesn't feel the need yet to rebel against everything we hold dear, so if I like comic books, so does he. Anything that has superheroes is nearly as cool as Transformers and Lego in his book.
So of course Free Comic Book Day is a great father-and-son geek bonding kinda thing. FCBD has been going for several years now, and it's always a decent event -- I like it even more in New Zealand as comics here are so much more pricey than in the US. Gotham Comics did an excellent job this year and Peter's Superman (sort of) costume was a hit.
Good freebies this year, too -- the kid-comics included a DC Kids' comics sampler, Transformers (of course), the Bongo comics crew featuring the Simpsons and the like. There's even a "kid-friendly" Wolverine comic (although I have to admit a "kid-friendly" Wolverine seems really bizarre to me) which the boy dug ("How does he keep his knives sharp?").
I haven't been following DC's superheroes at all really lately so the Green Lantern "Blackest Night" freebie did a good job of bringing me up to speed with all the various "new lanterns" mythology they've introduced. (Orange Lanterns? Really?) I'm not hooked enough to buy yet another huge crossover, but it was decent entertainment. Probably my favorite freebies were a surprisingly good old-school Avengers tale by Bendis that had the Dark and Light Avengers facing off, and a kitschy fun Drawn & Quarterly Nancy/Melvin the Monster sampler of '50s comics by John Stanley. FCBD books run from the adult "Love & Rockets" to "Archie," and it's a great way to get yourself and your kids exploring -- it's happening tomorrow in the US, so be sure to check it out if you can.