I found out about this from their iPhone app which was highly ranked recently.  The app seemed similar to others until I realized it was matching me with online people.  This blew my mind.  Some didnt respond but a lot did. Frigging cool.
When I was home I clicked on an email that took me to their site.  The website has way more features and a ton of online people.  It's basically what I do when I'm bored at work.  Haha.
Pros
Addictive.  Awesome way to meet real peeps
Cons
Hopefully the iPhone app will have a lot more people on it soon but it's fun either way
Visit SpeedDate.com Reviews about SpeedDate.com
Haha I just found out my roomate Rachel met her boyfriend on this site. Hopefully I can find a gf
Visit SpeedDate.com Reviews about SpeedDate.com