As Querblogger said above, I think one of the most popular domain parking company is Sedo. But just in case you wanna check some other alternatives to it, take a look at the list below..maybe you'll find something useful
1plus.net
activeaudience.com
afternic
cybersync.com
domaindirect.com
domaininformer.com
domainHop
domainguru.com
domainrightnow.com
domainSpa
domainSponsor
domainsystems.com
dotzup.com
fabulous.com
futurequest.net
goldkey.com
iMonetize.com
hostindex.com
namedrive.com
netvisibility
oversee.net
parked.com
parkednames.com
parking4income
parkingdots
parkingsite
parkingdots
parkpage.com
parkitnow
parkquick
premiumtraffic.com
revenuedirect
searchportalinformation.com
sedo
sedopro.com
siteparker.com
skenzo
SmartName
snapnames.com
streamic.com
trafficclub.com
trafficparking.com
tafficvalet.com
trafficz
webcom.com
whypark.com
PS: 1. You have posted the thread in the right category
2. Querblogger, I have activated the hyperlink for you
