[wfreestone]

I highly recommend the excellent Seattle Avionics SkyPad2 tablet Voyager EFB (Electronic Flight Bag):
which has an excellent optomizing (for lowest fuel prices, shorted flight route, and winds aloft) auto-routing flight planner, geo-referenced aircraft position (via a battery powered blue-tooth linked small WAAS GPS) on its VFR and IFR scanned and digital charts and IFR approach plates, automatic (no manual intervention other than having it on and connected to the internet) aviation data base updates, XM WX (via a blue-tooth linked receiver).
With its book style leather case open, it fits on my standard kneeboard via the kneeboard's standard spring chart clip.
There is availalble several subscription types, including a one-time $829 life-time subscription aviation ChartData database update (which I got for free when I purchased by SkyPad2 tablet EFB during a Thanksgiving Black Friday special).

I had previously compared it (in NOV 2010) with the iPAD and its various available aviation apps -- and consider it better. I still consider it better than the current iPAD available aviation apps.

For more info <http://www.seattleavionics.com/default.aspx>.
Or, see Seattle Avionics at Sun-N-Fun Fly-In this week (29 MAR - 02 APR 2011) in Lakeland, FL where (per their recent newsletter) Seattle Avionics has a special for the 1st 100 people who buy a SkyPad2 at Sun-N-Fun.

William W. Freestone
(an extremely pleased Seattle Avionics SkyPad2 tablet Voyager EFB customer).