FWIW, at this point, I have no plans to write any software for any PDA/smartphone I may buy -- I'm just waaaay pass that phase now.
I do work on backend software that ends up being used/accessed on Blackberries (and maybe eventually iPhones/iPads) though, which was one of the business reasons we gave when our small dev team requested BBs, but yeah, I'm already getting paid for that (and have the "free" BB). 
Actually, check that. I'm sorta a fantasy baseball nut (amongst other things
), and I've been toying w/ the idea (on-and-off for years) of creating a web app specfically for the purpose of hosting dynasty FBB leagues as a labor of love sorta thing (w/ extremely long odds potential for more
). And if I were to finally do that, I would probably also want to create some sort of PDA/smartphone client for it as well. But no, it would not be the kind of thing your average consumer would care about. Just another geeky app for another kind of geek. 
As for emacs geeks, I guess I don't qualify since I don't have a beard -- and even if I have one, it wouldn't be grey (yet).
VisualStudio has come a long way, but there are still some very simple things I miss about emacs (and even its lesser DOS clone, Brief), eg. keyboard macros (unless it's hidden somewhere I never looked).
RE: beloved OS/platforms, how 'bout GEOS? I had an HP Omnigo 100 (and even installed GEOS 3.x? on my PC), but the Palm Pilot was just too strong back then. Apple Newton? Another partial victim of the Palm Pilot. BTW, whatever happened to Motorola's handwriting/voice(?) recognition software that they targeted for the Chinese market way back when Apple gave up on Newton (since the heavily Romanized standard keyboard remains to this day a difficult thing to use for Asian languages)?
How 'bout NeXTStep (w/ Objective C and whatever the NeXT dev framework was called back to which .NET and C# tends to harken a bit for me)? Another of Steve Jobs' abandoned-and-long-forgotten offsprings that probably got out-muscled by the whole NT vaporware phenomenon -- and yeah, I actually installed the first available Intel-friendly version on my PC (that required a SCSI CDROM drive) too. Actually, doesn't the current Mac OS employ some aspects of OpenStep, which was NeXTStep's heir-apparent offspring?
I'm sure there are plenty more that elude me just now...
Anyway, no idea if Android will actually get very far w/ freelance app dev, but that's not why I'd choose a device that runs it (or something else) anyway...
_Man_