Sharp Zaurus all over again ? I hope it doesn't end that way, but there are similarities.

This is where toolkits like Python + pyGtk or pygame could really help. Faster prototyping and development, and your app runs everywhere from desktop to PDA to 770, with little if any modification. It actually works. Unfortunately, I'm not sure which is less of a niche, the 770 platform or the above tools :-)