Found this great site the other day - its all about discovering the city that you live in and sharing those hidden gems (where to drink late in soho - good cheap vietnamese etc). Its a pretty simple but effective use of 2.0 but speaking to the guy that set it up they're goiung to be adding a bunch more functionality and most importantly they're super into throwing parties for people that use the site - Will and I went to one the other day and it was pretty awesome ch check it out y'all  -  http://www.tipped.co.uk/