Zynga boss and Sherpalo Ventures founder also chip in to e-publishing venture.
iPad app publisher Callaway Digital Arts has secured a $6 million funding round from some big names in the investment world.
Kleiner Perkins Caufield & Byers' iFund led the round, making Callaway its latest investment following the likes of ngmoco, Booyah and Shazam.
Also chipping in were Sherpalo Ventures founder Ram Shriram and Zynga CEO Mark Pincus.
Callaway Digital Arts focuses on interactive book-apps, having released Miss Spider's Tea Party and Miss Spider's Bedtime Story for iOS devices, as well as (this week) Martha Stewart Makes Cookies.
It's a spin-off from book publisher Callaway Arts & Entertainment.
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"Callaway Digital Arts is one of the very few interactive publishers to fully understand and exploit the iPad's transformative capabilities as a publishing platform," says KPCB partner John Doerr.
"Callaway stands out as a leader for its artistically beautiful and addictive iPad apps, as well as the pipeline of high-quality content owners it has lined up as partners."
The company will use the funding to continue building its studios in New York and San Francisco, while signing more partnerships.
"We have a three-part content strategy: forging partnerships with great publishers and brands like Martha Stewart, nurturing the storytellers of the future, and expanding our portfolio of intellectual property," says chairman and chief creative officer Nicholas Callaway.
