Hopefully this puts the whole "Firefox on iPhone!" crap to bed..
This kind of stuff will continue until Google's Andriod becomes wide spread. Apple has changed policy in the past due to direct competition. One example is the 30 day free download evaluation of Aperture. What other Apple pro apps can you download and try for free? Which other Apple pro apps have a direct competitor that offers a free 30 day trial? In a few years Apple will have to compete with Google's app store and then Apple will change the policy.