Barbaric MMO Age of Conan is offering a holiday deal of an unlimited trial to all comers who sign up before Jan. 1. The free account allows you to play levels one through 20 gratis, although public chat, in-game mail and forum postings will not be supported with the free accounts--you don't want to make it that easy for gold farmers.
Although I'm probably not going to take advantage of this offer for the same reason I don't take advantage of the "free tastes" offered by local heroin dealers, I do salute and support this method of gaining new customers. Twenty levels is a lot of trying before buying.
Check out the official site for more Conan details.