wheretheladies.at
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Founded by Path’s Danny Trinh and Digg’s Jeff Hodsdon, Wheretheladies.at is an iPhone-friendly web service which uses Foursquare to gauge how many females have checked into venues in your vicinity, stack ranking and featuring the places that have the most women checking in.

The service crawls the Foursquare API to track female check-ins based on first names, which admittedly leaves room for inaccuracies.

Says Trinh, “The few chicks that check-in are a decent sample of where more might be.” Using any female check-ins as signifiers of an even larger “lady” ratio, itâ€™s like Trinh and Hodsdon have totally made an app giving nerds some kind of advantage in natural selection.

And while apps like “Assisted Serendipity” and “Kissmobs” attempt to do something similar, Wheretheladies.at has the simplest solution UI-wise for the moment. The service, which started out as a joke between friends at SXSW, is currently experiencing high volume traffic in San Francisco and is branching out to other cities shortly, targeting New York, LA and then Minneapolis. A Wheretheladies.at iPhone app is also in the works, which, get this, is JUST A BIG COMPASS POINTING YOU IN THE DIRECTION OF LADIES (see screencap to the left).