[mors]

IE or Gecko on mobiles don't have any real significant in usage, despite IE having a board deployment. Users of less capable devices with less capable browsers will less likely use highly interactive websites because their crappy browsers can't simply handle them.

However, everyone here is constantly ignoring Opera. Opera's Presto competes head-on with Webkit in standards support and performance and has higher market share. And Opera Mobile has the best mobile UI in the market (although that's debatable due to personal preferences) and biggest feature set.

What's really a disservice and plan stupid is to outright ignore Opera and even worse not mentioning it entirely when discussing mobile app or mobile web app development.