AAA Trip Tik Mobile - Good for finding campgrounds; don't know if you already have to be a member.
Border Times - Wait times for border crossings
Google Earth
The Photographer's Ephemeris - Although I use this to determine sun & moon rise & set times it also gives the location of each; useful if you have solar and want to park in the right direction...
I have the Android phone and use "My tracks" almost every day.. It great for hiking/biking.. It track distance, speed, elevation, time, moving time and does all the average calculations. It uses the GPS function.. I also use 'Fring' & 'Sipgate' that allows wi-fi calls it's a tad buggie but I intend to use it when I leave the states so I don't pay for those expensive calls..
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Former 17ft Plan "B" Escape
Toyota Highlander w/tow pkg