Using the new Google Analytics Data Export API, a number of developers have created mobile solutions for accessing GA Data on iPhone and Android phones. Note, it still takes system some time to process your data, so if you're checking today's data, proceed with caution.

For the Android OS: Check out Mobile GA app allows to quickly identify what metrics are changing on a site. And for the iPhone: Analytics App, The Google Analytics for iPhone App, and Ego App allows you to consolidate reporting from different services, such as FeedBurner and Twitter, all in one simple dashboard.