Techcrunch has a guest post today from Google VP of engineering for mobile Vic Gundotra, which pinpoints the factors that will drive the growth of the mobile Web.

Among them are the easy-to-use mobile browsers (i.e., iPhone and Android-based devices), and the introduction/growth of application marketplaces. The arguments aren’t anything ground breaking but are supportive of many claims we’ve made here, and provide lots of good Google data (nearly 50 percent of Google mobile searches happen on iPhones).

It’s a good snapshot of where we are now and where we’re headed in mobile search.