Source: http://feeds.gawker.com/~r/lifehacker/full/~3/311122091/use-a-fluid-webapp-for-user-agent-tricks
If you're a Mac user who's been intrigued by the things you can score by pretending Safari is an iPhone, such as free full magazines and Starbucks web access, the Tech-Recipes blog points out that you can save yourself the hassle of enabling and switching over your browser's user agent. Simply install the webapp creator Fluid and create a specific stealth-iPhone agent within Fluid's interface. Now you can keep a shortcut to magazines, your email, or whatever needs a work-around tucked away for when it's really useful.
