Roberts says the company is aiming for social gaming next -- Zuma Blitz is going to be the next big push, and PopCap is very tuned in to the relationship between the iPhone and Facebook. "Our customers love it," Roberts says about combining iPhone games with Facebook stats. "It is really sticky. It gets people excited about playing." It'll be interesting to see what PopCap does with Apple's Game Center -- presumably, they'll include the functionality in their games sooner rather than later.
Finally, Roberts says that a lot of casual game companies have come and gone in mobile gaming, but PopCap has endured, mostly because they simply work hard on making great games, and selling those in as many places as possible. "We've made more money on mobile gaming than probably any other company except for EA, just by doing our thing," he says. And as anyone who's enjoyed a Plants vs. Zombies marathon will tell you, we're glad they did.