Definitely agree that networking is one of the best parts.
I was at the same Startup Weekend the author of the post started Party With a Local at (swAMS '12) and one of the people I met there is now my co-founder!
Yes indeed, I was at SW London in 2011. What were you working on? Still working on it? I totally agree the networking is one of the best parts of SW, I've met some great people via it.
I was working on a site for foodies called Foodedoo and we did not continue after the weekend. It was my first Startup Weekend and I had a great experience anyway.
"With a few exceptions, most team members go back to their real lives, day jobs or studies the next day." That's what I've also noticed.
I think that networking with like-minded people is one of the best part of Startup Weekend (and similar events).