Hi GoPC,
I am developing mine, some as content rich sites others as just basic development for Google and Yahoo!
I've given-up totally with this parking fiasco, although I only courted it briefly after being approached by Sedo to return in the late summer. It just seems daft to me why Google should make 50%, parking site like Sedo make 25%+ (I have always doubted if a unique visitor clicks on two seperate adds that you get paid for both), and we the poor muggins of a domainer get what crumbs are thrown at us!
By the way the question about double clicks from a unique visitor has never been answered by Sedo!
I mean the real joke is when I buy a domain at Sedo auction, list it and point it at Sedo and a week later Sedo still have not managed to clarify for their system that I even own the domain!