I hope I'm wrong but, I think within a few years it is going to hurt the price of .com's
One of the best assests of owning .com is that it gets traffic from other TLD's. By that, I mean if you have example.net a lot of people will type in example.com. With all the new TLD's coming out I believe people are not going to automaticly type in .com nearly as much.
Also, owning the .com made a site appear to be the authority site. With all the "s"(specialty)TLDs that may not hold.
PS: Webwork, I like your "s"(specialty)TLDs :)