I collected beer can pins when I was younger, too...
I used to collect the Slam magazines. From the one where Grant Hill was on the cover (issue number 7 or 9, or something like that) to the one where the Nets starting five is on the cover (the 2nd one, with MacCulloch, Martin, Kidd, Kittles and Van Horn), I got almost all of them. I got some special issues too, "Kicks", the Michael Jordan one...
Now I'm starting to collect DVDs, I have almost 30 in over a year.
I also collect music... almost 400 albuns, and almost 2,300 mp3 albuns, mostly rock and brazilian music.
I also collect books... have almost 150 books, from many varied topics.