In Los Angles, we're spread out all over the place.  Within the same city my friends up to 30 miles away in every direction.  That's why Web sites that put me in touch with other city travelers are an important tool to solve the dilemma, "But I don't know enough people near me to make this work.

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Highlighted at planetgreen.com is a list of the best online carpool resources featuring: Carpool Connect, eRideshare, GoLoco, and Carpool World. This article point out that most of the differences between the services have to do with style and usability.

Here's the review of the site that looks most useful to me:

GoLoco: A sort of mash up between a social site and a carpool service, GoLoco matches rides to prospective riders within its community database. You sign up and create a profile where friends and family can touch base with your projected traveling. GoLoco certainly displays the most personality—it makes arranging carpooling seem like checking in on your MySpace page.