I carry a notebook, (Toshiba Satellite & Canon printer), with me for reports and invoices.
I also have a A4, day to a page diary, sometimes three diaries in a year, (not as good as they used to be).
Like Tony, most entries are in pencil, so that I can re-arrange work, (defense housing is notorious for changing uplifts).
Notebook entries will never replace the diary, for me anyhow, but with a portable bubble jet printer and an inverter fitted to the vehicle, I can do all my paperwork on site, with no fear of flat batteries.
Apart from that, when I get home and download to my pc, I can still read everything.
I take the notebook with me when I travel to seminars, but I will only take a palm held when I go stateside later this year.
Cheers,
Shorty.