given all the things you can do with an iphone these days... the mount for it is actually pretty cool.
ballistic calculators (including KAC's which pulls local weather from the internet and measures the angle to target using the iphone's sensors),
google maps/earth and tons of GPS apps,
streaming video,
video capture,
mp3 playback of wagner's ride of the valkyries,
and of course, tetris for those 8 hour stake-outs
of course, not all at the same time...