The mobile site has worked great for me during my last two trips out of DCA using my Blackberry Bold. My mobile boarding passes were scanned successfully on the first try each time at DCA and at SLC. Flight status has also been working well, although there are still a few issues with the formatting as mentioned above.

I found it particularly useful during the WX/IRROPS last weekend when I was trying to get back to DCA from SLC. I had checked my flight status before heading to the airport, but when the lines stopped moving I suspected something was up. Just before agents made announcements about cancellations into EWR and JFK, I was able to see that my flight had been canceled, as well as see my automatically rebooked itinerary. I also received text message updates and the automated phone call within a span of a few minutes. The heads up allowed me to call SMS to get my wife and I rebooked before all of the few seats left out of SLC were gone!

I wholeheartedly agree that it would be really nice to see all legs on a given PNR, instead of just the first one. At least for me, the mobile site is evolving in the right direction ^.