Are you sure there isn't a pre-production Pandora for sale? Just one? Maybe I can buy it off of someone who has already used it and planning to sell it or something.
Pre-production Pandora's cost about $3,000 each to make, so if someone decided to sell you one, I think the project leaders would have the heavies round there house pretty damn quickly
But that apart, If I can't get access to a pre-production pandora, are there any cross compilers that i can use to write for the pandora? And also, a list of some important API's available for the Arm Platform like the SDL, would be helpful so I can decide which one to use and avoid using libraries that are closed source and don't have ARM versions!
Your best bet is to use a Beagleboard or Gp2X or Wiz, that way you know your app works on an ARM platform and that all the required libraries are already available. Alternatively if your only interested in SDL, then develope on Linux or Windows on your PC. The code isn't going to change much if you restrict the resolution to the same as the Pandora's.
I wouldn't bother with scratchbox. Either develope on Windows/Linux or buy a 2X/Wiz/Beagle.