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Dalton Caldwell, co-founder and former chief executive of music startup Imeem, appears to be working on a new company called Mixed Media Labs. And he has raised $370,000 of a targeted $600,000 in debt financing to get started, according to a filing with the Securities and Exchange Commission.

Despite getting off to a promising start, Imeem struggled to make its business work, and was acquired and shut down by MySpace last year. Most of its staff was laid off, while Caldwell and other executives were kept on only as consultants to help with the transition. So it’s not surprising that Caldwell is moving on to another startup. The filing also lists Imeem’s former chief operating officer Ali Aydar as a director at the new company.

Facebook will finally make itself heard in the rapidly developing world of location-based services, according to The New York Times. The company will unveil a location-based feature at its f8 conference in late April.

Nick Bilton reports:

The new location feature will have two aspects, according to the people familiar with Facebook’s plans. One will be a service offered directly by Facebook that will allow users to share their location information with friends.

The other will be a set of software tools, known as A.P.I.’s, that outside developers can use to offer their own location-based services to Facebook users.

We had been told of at least five geolocation projects being hacked on last month at Facebook, but it was unclear whether any of them would get the green light to go to market. (The company, which prides itself on hiring engineers that build and break projects quickly, always has several experiments in the works.)

Gareth Davis, the platform manager in charge of Games at Facebook, delivered his keynote today at the Game Developers Conference in San Francisco. Davis focused his talk on the changes in social gaming and told the audience that, despite FarmVille, the killer social game is still “out there”.

“Early cinema evolved into a specific language for that media, bringing about cuts and edits and certain types of shots,” Davis said. “Every new media brings new content and every new platform brings a killer game. There are many examples: Sonic, Halo, Mario. I believe the iconic Facebook game lies still ahead of us. The ‘Mario of Facebook’ is out there. And, it will likely come from someone in this room. Pretty exciting.”