I signed up for OKCupid in November of last year. Getting back into the dating game was quite weird after two failed marriages.
Yep, I met a few duds, but I also met some very attractive, very intelligent, sexy women. I met my girlfriend of six months on the site -- I think she contacted me first, but I'm not sure.
Here's the key: BE YOURSELF.
 Offer an honest portrait of yourself.
 Upload pictures where people can get a good look at you (so, duh, no sunglasses, no pictures of scenery with you a little splotch in the far left corner). They should be recent, and they should show you enjoying yourself. They could be conversation starters.
 If you find someone fascinating, drop them a line; if they respond, great. If they don't, move on.
 If the conversation remains at the 'small talk' level, it's your option, but I'd say move on.
 A neutral location is a great place to meet for the first time. I like Starbucks because they have nice chairs, a variety of nice drinks and they don't hustle you out the door after ten minutes. Chat. Did I mention BE YOURSELF?
 If you both discover that you've been talking for 45 minutes, that's good. If you're struggling to keep the conversation alive after five minutes, that's good -- it's not happening. Move on.
 I took two women to shoot pool because it's something I enjoy. They both had a blast. Don't try to manufacture some 'event'; do something fun, something you want to do.
And no, I'm not some twenty-something living in his Mom's basement. I own my house, and I finished university thirty years ago.