Font comparisons (screengrabs)
I've been mucking around with fonts on my rooted JP3 (by replacing DroidSans.ttf and DroidSans-Bold.ttf and rebooting). I'm beginning to realise what a great job the designers of Droid Sans have done - to my eye it just seems so balanced and "just right" for the device.
However that didn't stop me thinking some other humanist font could look/read better. And whilst the fonts I did try out (below) could be useable, I just kept thinking things looked so much better with the default (and I suppose the whole OS is designed with Droid Sans in mind ...).
Anyway, here are screengrabs of a random email to demonstrate readability (MyriadApple, LucidaGrande, Calibri).