How many devices?

Tim Bray brought up an interesting discussion on his blog today:

Does it make sense to carry around two, three, or more portable computing devices?

Select from:

  1. Regular-size laptop; say 15”-screen or higher.

  2. Skinny laptop i.e. Air at 13” or even 11”.

  3. Big tablet at ~10” as in current iPads.

  4. One-hander tablet, typically at 7”.

  5. Handset, 3½”-5”.

    *items in strike-out = my ideal combination, assuming a 4.3inch handset.