Those of you with fairly powerful smartphones. Have you been able to find apps (like LaTex editors) and mobile hardware (like portable keyboards) that have let you leave the laptop at home when traveling? I'm thinking of getting a small portable keyboard and mouse and then traveling with only the phone. Though I have an Android, I'd like to hear from all smartphone users for ideas. Is this realistic or is it more trouble than it's worth?
p.s. I'd prefer not to use a remote desktop app since that requires you to be connected in order to work. That rules out working on the plane. I'd prefer to hear offline solutions.