GunBroker have launched a version of their website optimized for mobile web browsers such as the iPhone, Blackberry and Palm Pre.
It is very simply and bare bones, which is exactly what you want when you need to quickly find out what a certain gun is selling for, after spotting what you think is a bargain at a gun shop or gun show.
I took the below screenshot using the newly released Palm Pre emulator.
The mobile site is at http://m.gunbroker.com