Apple has posted a new iPhone movie, this time focusing on one of its most contentious features - the virtual keyboard . Critics have cited the lack of a physical keyboard as one reason why the iPhone could fail.

However the first iPhone reviews - published this week - have largely exposed such concerns. Walter Mossberg at The Wall Street Journal said the virtual keyboard was a non-issue . He said he was typing as fast on on the iPhone after a week's use as he had been on a Palm Treo he had been using for years.

In the video, Apple cites four reasons why the Apple iPhone's keyboard is so good:

Apple says you can migrate from one finger to two thumbs typing in less that a week and that "you'll quickly find your self typing faster on the iPhone than with any other small keyboard."