I've written software that takes this concept much further. As the user browses, the software runs checks on a name before requesting each page. If the name servers are sedo, goldkey, etc. the user receives page warning them they are about to visit a parked page and offers them the option to click through to it or select from a number of links to correctly spelled sites. It also checks the whois information and gives a similar warning if the site is owned by a known spammer.
If everything is ok here it requests the page. It checks for redirects to sites owned by someone else, ie if you redirect to sedo instead of using their name servers you get the same message. It looks into the code of the page to see if it's framing anything from the parking or known spammer database and warns if it is. It checks the the content of the page and warns if there are lots of ads and not much content. It also has the option of removing banner and text ads from all the major PPC companies.
I've been running this software for years and everyone in the office loves it. It's only a matter of time before someone like Microsoft develops the same thing and uses their long reach to get it installed on 90% of the machines in the world. And when that happens the domain world is going to change.
