I actually used to collect em! I had an actual Zippo display case and everything. I still have probably about a dozen of em laying in a box in the attic no doubt. Yep, they were/are the best lighters ever IMO. I have some from WW2 that, even going through the war, they still worked!
I have quite a few Zippos. My favorites are the ones that I got from Camel cigarettes with my initials engraved on them. I can't recall exactly, but I believe that I had to send in X number of labels from the packs to get them.
My most trusted is a Ronson butane lighter. Doesn't dry out like the Naptha fueled Zippo lighters.