A vegan is the opposite of an ovo-lacto vegetarian, I think, in that vegans deliberately shun dairy products and eggs. Typically prefixes in front of "vegetarian" designate foods that they do eat; i.e., ovo-lacto vegetarians consume dairy products and eggs but not meat. Where I'm confused is whether "ovo-lacto" is assumed for non-vegan vegetarians or not.
As for the leather thing, I actually don't think it necessarily falls along vegan/vegetarian lines. Not wearing leather is typically a sign of ideological vegetarianism (not eating meat because they actively think human use of animals is morally suspect), not other forms. Since I know a fair number of vegetarians who do it for health or food-preference reasons, it's a distinction that can be made. I suspect that more vegans are ideological than plain ol' vegetarians, but I don't actually have, you know, data points for it...
TOUAMB, I'm going to tell you a secret. It is a secret about me. I have kept it as a secret because I know that some don't approve of this thing I'm about to tell you: I am vegan. I am vegan but I am not pushy or haughty about it, and as long as people don't pester me just to get a rise out of me by telling me how many fieldmice are murdered by grain threshers every year, I am pretty cool with meat-eaters. I have kept my veganism a secret until now because it hasn't been terribly relevant, and also because I wanted to make as good an impression as possible to all of you in the hope of staving off potential judgment based on my eating habits. Please don't hold this against me. I promise I am not a dick like Pat (plus I am a girl).
Personally, I try to stay away from leather and suede and the like as much as possible, but I own a pair of Birkenstock clogs and my sneakers have a bit of leather trim. I eat honey because I don't believe that bees are harmed by humans' harvesting of honey, I don't eat gelatin because, in the words of C. Montgomery Burns, "It's made of hooves, you know!" I did not know that gelcaps contained animal bits, but now that I am enlightened, it seems obvious. I'll have to investigate further before I make up my mind about whether or not to ingest them.
That felt like coming out of the closet. Don't kick me out of the house, Dad! I don't want to join the Army!
PS - #####_god, I am a bisexual vegan. What of that?