I actually met my current BF on one of those online personal dating sites. I didn't have my own profile, but this was a site where everyone was giving out their AIM screen names, so I randomly IMed some people. My BF was the only person I ever met from online in real life. We talked on AIM for three months before meeting in person. We have been dating since November 2004.
I think that talking online has helped us have a headstart.. so to speak. It's harder for me to form relationships from people IRL. I guess I haven't had many opportunities, though, because I have been with current BF for awhile. Though, I think it's a little easier for me to open up on the computer.. and when you meet, you at least have some background information. I'd perhaps do it again.