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It's official!
Every four letter combination dot com domain has been registered at one point in time. Aftermarket sales, expired drop catching or backordering are now your two options for acquiring an LLLL.com domain.
The prices are not expected to sky rocket but they will increase some, especially for those few good quality words and abbreviations. I will do my best to follow the trends on sales, LLLL domain drops and report on the latest news from around the domain industry blogosphere related to this event. • source

Four Letter Domains: The New Vanity License Plate
Take for example, a domain I registered earlier this month, "RSXJ.com" this was an expired domain that I caught by chance. Mind you, it has been a few weeks after all of the four letter domains were registered. My first impression of the domain name concluded that this was the perfect domain for an "RSX Junkie" or some old Joe, John, Jacob, Jingle, Jack and Jill, all of whom drive Acura RSX's of course. • source