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Seattle angel investor Geoff Entress has joined the board of Treemo Labs, a maker of mobile applications.

A member of the Founder’s Co-op team and a venture partner at Voyager Capital, Entress is as well known investor who has backed companies such as Cheezburger, Isilon and Shelfari. In fact, he was an early investor in Treemo, backing the company in 2007. He also just joined the board of Banyan Branch as part of the social media agency’s $1.7 million venture capital round.

Other board members at Treemo include Swype CEO Mike McSherry and AdKnowledge President Brett Brewer.

Treemo is led by Brent Brookler, an entrepreneur who previously served as president of games and entertainment at Mobliss. It runs the mobile applications for several CBS properties, including Survivor and 60 Minutes.

While some may look at Treemo Labs as an app development shop, Brookler is quick to point out that it is much more than that.

“We are an apps publishing platform, believe me,” said Brookler, adding that more news will be coming on that front in the coming weeks.

Entress agreed with that assessment, noting in a statement that the company is well positioned to capitalize on the growth in the tablet market.

An offshoot of mobile social networking company Treemo, Treemo Labs employs about a dozen people and has raised more than $4 million to date.

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