I had an idea years ago for a web site that seemed unique. Half the trick of being successful is having a unique idea.
The idea was for some kind of social networking site/forum/whatever where people could post their experiences in shops, restaurants, bars… especially if they had good service. In particular, I wanted to pick out staff who were particularly friendly, nice, good looking or just plain sexy as hell.
I did set it up, but it went nowhere and nowadays, sites like Facebook and Twitter allow you to do the same thing very easily.