Heavens-Above.com is cool, but a little unwieldily to use, especially on a mobile phone. This is a little web app I whipped up that uses the Unofficial Heavens Above API to retrive upcoming pass information for the ISS based on my latitude and longitude.
I’m hosting this at iss.thebigreason.com. It’s currently hard-coded to use my geo location, but I plan to add HTML5 geo location in the near future.