It uses Skweezer to reduce page bloat. That includes your ads.
Designed to minimize keystrokes, increase navigability on small displays and accelerate page loads, Ask Mobile offers a special interface and search tools to help searchers find what they are looking for faster. The announcement was made at DigitalLife, a consumer event in New York City dedicated to educating consumers on what the digital lifestyle means in every aspect of life - at work, home and play.
ask.mobi is a premium name, which means is not available for purchase yet. I guess they could not take it in the trademarks period since they don't hold a trademark on that name, so it was put in the premium list. So, ask.com will have to compete amongst other domainers to get his .mobi version.