Amazon.com Gets Patent for Selling and Leasing Domain Names
Amazon granted patent for domain name marketplace.

This patent, which was applied for in December 2007, seems to conflict with a number of existing domain name marketplace and domain monetization technologies that were commercially available at the time the patent application was filed.
One conflict in particular is Sendori, which offers a bidded marketplace to “lease” traffic that goes to a particular domain name. The leasing system described in Amazon’s patent would allow someone to go to a marketplace and lease a fraction or all of the traffic to a domain name. The marketplace would then split the traffic accordingly through a redirect. However, Amazon’s method may lease a percentage of traffic for a set period of time rather than on a per-visitor basis.
The marketplace could also offer domain names for sale and may also include some sort of valuation technology. You can read the full patent here (pdf). Abstract:
A method and system are described that enables a domain name owner (i.e., a “lessor”) to grant a third party (i.e., a “lessee”) a lease to any domain name the lessor owns. More specifically, a lessor may use a domain name service to allow a third party (i.e., a “lessee”) to lease a domain name for use or to purchase the domain name outright. More specifically, the lessor may lease a domain name to the lessee so that any user who accesses the leased domain name is redirected to a network resource identified by the lessee. The lessee may also be provided the option to purchase the domain name outright from the lessor, rather than lease it.
http://domainnamewire.com/2010/09/28/amazon-com-gets-patent-for-selling-and-leasing-domain-names/