adgrunt purplesimon just nudged me over to the Worth 1000 Vintage Ads series [1], where new products appear in old style ads - or as they explain it (so much better) "Modern products in a vintage light".
I haven't had time to go through all of these yet but some of them are hilarious, which ones are your favorite? :)
Links:
[1] http://www.worth1000.com/galleries.asp?rel=Vintage Ads&display=photoshop&id=18731
[2] http://technorati.com/tag/advertising news