The question was asked on another Board and not answered yet...but would the XO Laptop have any application possibilities for cave survey software?
The current Donate one get one offer(valid till end of year) with a year of T-Mobile wifi hotspot service and a tax write-off is a great opportunity to get one now if it has any application possibilities.
More Information on the device: http://en.wikipedia.org/wiki/OLPC_XO-1
Laptop Magazine Review: http://tinyurl.com/26jm6e
To Purchase/Donate: http://laptopgiving.org
Main Site: http://www.laptop.org
Mark Passerby, Cavediggers.com