Accel Partners, the venture firm that has funded one of Silicon Valley’s hottest start-ups, Facebook, has been pretty active in putting its money to work, though none of them as high profile as the hot social network.

The latest start-up to get their dollars: Mochi Media, a gaming ad network (focused on casual games) and flash analytics company co-founded by Jameson Hsu and Bob Ippolito. In time, this could actually turn out to be one of their better bets. As casual gaming grows – everyone seems to be doing it – the demand for services that help people monetize these games is going to increase.

Accel Partners’ Ping Li led the investment in this first round of investment. The company has been around for a while. James Hong and Jim Young had initially invested in the Hsu idea as angels.

The company has a lot of traction in the web, and has some of the bigger casual games such as smash hit Desktop Tower Defense game are using Mochi Ads. Hsu and his co-founder reportedly have a lot of stret-cred among the casual gaming community.  “Our goal is to develop a network of properties that makes building web content fun and prosperous for our community of developers,” they say on their blog.