First the fun dudes over at zoomdoggle.com came up with this ingenious concept of using pennies as advertising tools for their site, which took tons and tons of patience, but when you think about it is probably more cost-effective than banner ads. The question is, are they more impactful? I.e., are people more apt to pick up a free penny (and visit the web address on the back) than they are to look at (and click on) a banner ad? The whole project is sociologically fascinating, if you ask us, and we might just have to rip it off for ourselves and do further testing with it.

Then a few of the zoomdoggle dudes took to stashing Indiana Jones hats - 800 of them – in strange places in 4 cities, with messages inside saying they could keep the hat if they posed with it and uploaded the picture to Flickr with the tag Indihat (or Indyhat).

Given that this perfectly coincides with the release of the Indy DVD, I doubt they paid for the 800 hats out of their own pockets – obviously the studio is behind the stunt. But it takes that irritating “fake $20 bill on the ground” thing to a whole new level – one that feels more like a fun scavenger hunt and less like a total ripoff…