ChicagoMixer.com is free. they're prb new. i just emailed the admin about them to check em out. they don't show ads either, so not sure how they make money. anyways, if you're in the chicago area, prb should check them out.

It looks like a new service (says in the tour) plus not a huge database of users. Dating Sites like this offer a free service to singles for a while to increase there member numbers. At a certain point they will probably start charging. It is a well designed site. Hopefully it will attract some members.