I have something nice to say about United Airlines. I know, I know, a certain very hot location may have just frozen over.
On a recent trip to Las Vegas, I gave the mobile boarding pass a try. I have a Blackberry Storm with a cracked screen - probably NOT the ideal candidate for such a thing. However, it all went well. At the SFO airport security line, I was mostly worried about losing my signal and not being able to pull up the barcode again. At the kiosk, I was asked to hold the phone to a scanner. First take - nothing happened. I tried again and I received a green light. Yeah!
At the gate I had a moment of panic when I lost cellular connectivity and couldn't re-open the saved web page. There may be a way to save the barcode page as a file on the phone - if not, maybe I should read the FAQ on United and learn what happens if I can't! Again at the gate the first scan didn't work so I zoomed in on the barcode and tried again - GREEN LIGHT! YEAH!
Overall, it was fairly easy to use. I'm trying it again on the way home.