I tried the Bamboo Paper notepad app on the iPad. It writes smoothly with a finger or stylus, but I didn't see typing capabilities. I tried Remember the Milk on the Kindle Fire and it is type-based. It would be good for lists. However, I share the Kindle so don't take it with me. And you must pay to upgrade to receive reminders.
Dragon Dictation would be of interest, but it seems to be Apple only. Another one to try: SpeakToIt . . .