As time goes on, handheld development seems to be taking a bigger and bigger share of the computing world. That being said, finding ways to reach as many of the different handheld systems as possible can be a challenge. One contender for the solution: Sencha Touch.
Check it out, courtesy of Ed Spencer:
There is also an accompanying video explaining these slides here, available courtesy of Pivotal Labs. I couldn't find an embeddable link, but the video is available for download in MP4 format here.