I don't think I could get into casual dating or even the usual system of Find attractive person, Go on date, Go on date, Wait X number of dates to be "official" or whatever. I'm the kind of person who could only be attracted to people I'm already pretty good friends with, so it kinda just evolves out of that friendship.
I haven't been in a relationship for a long long long time now though, in fact I only recently got over all the stuff I went through after the last one. Let's just say I convinced myself that something was there when it actually wasn't, and it took years to un-convince myself and get closure on that. The good news is that he's now one of my closest friends, and I'm really lucky to have someone that was willing to be there for me with all the crap I put myself through. Moral of the story: always be willing to patch up a friendship after a romantic relationship, but it'll probably take some work. Also don't be a crazy person like me and decide that somebody is The One when they're really not all that attracted to you.

It won't go well.
Now I'm not really attracted to anybody, unless you count that one friend of mine who I always fake-flirt with, but he has a girlfriend and now I think I'm pretty good at knowing when there's not a chance. So really I'm just waiting for somebody to come along, I suppose.