I love my iPhone - it is one of the single greatest inventions ever. I'd love to see one of the brewing applications ported over to the iPhone, but I wont hold my breath.In the meantime, the iPhone is great to use for conversion calculations and to use as a timer. There is also an app called beermath, or something like that, but it is 5 bucks and I am not willing to spend my money on an app where I can get the info for free on any number of websites (which I can easily access with the iPhone).One great app that is free that I downloaded is the "Beer Judge Certification" (BJCP) program. It is laid out nicely and provides all the information one needs for almost all beer types. I recommend it for brewers and non-brewers alike, as it has a bunch of interesting information related to the various beer styles.For those without an iPhone, you can still get this information at the BJCP website.For those with an iPhone here is a link to the app in the appstore.On a related note - there are a bunch of great podcasts that are available for free that relate to beer, craft brewing, and homebrewing. There is one out there on sanitation that was great. I'll try and locate it to post in the future.