After purchasing Keynote Remote from the iTunes store a couple of months back I was disappointed that it only worked over WIFI (why do we have bluetooth in the iPhone again?). Most conferences have spotty WIFI at best.
I had an idea today though about using my computer’s built-in network creating ability. I set up a network from my laptop, connected to it from my iPhone, and had the Keynote Remote working in no time. No WIFI network. Yay! After I had figured it out I looked up on google to see if anyone else had done it and found they had. There’s a tutorial with screenshots here: http://www.italkmagazine.com/using-apple-keynote-remote-without-wifi/. I should have googled it earlier. :)