No, I'm not starting another poll, so let's get that out of the way first. :)
Do you have a favorite physics app that you've found for your smartphone? There's been a lot of apps being written for the iPhone/iPad, Android phones, and Blackberry. Still, are there really good and/or useful apps in physics? I have a Blackberry, and the only stuff that I've found that would be remotely considered to be useful for physics work would be the standard, generic stuff - periodic table, scientific calculator. I find that I use the browser more often to look up stuff, rather than rely on apps. But then again, there aren't that many apps for the Blackberry when compared to Android and iOS phones.
So, have you found apps in physics for Smartphones that you think are quite useful?