Emulators... that would be cool but will require some "opening up" (figuratively speaking) of the hardware. Needs one of the Hong Kong companies to do their usual to allow us to get "homebrew" onto it. Apparently only one of the 2 CPUs is user programmable but it ought to be fast enough for ST emulation and the usual Megadrive/GBA emulators.
I wonder what PDA-like functions could get on there. If it has IR an IR keyboard could be used.