1. The 5600 has a reflective LCD screen, so it is quite readable in direct sunlight. It isn\'t perfect, but it doesn\'t get washed out and no other PDA I know of is any more readable in direct sunlight.
2. Bash already comes on the 5600. awk and gcc are available to install
3. GPS from gcc? There are several GPS solutions, but no route planning software, only maps. Search the forums for GPS for more
4. Search the forums for IRK (the Zaurus IR Keyboard drivers) for specific keyboard support.
5. The 5600 will happily work with the IBM microdrives.