i used to keep a training log but life got really busy and stopping logging rides a few years ago.

there is no doubt i have improved and am on a structured program, but do you keep

milage, both that day and total for year
mph
max speed
diet
your weight
who you rode with
how you felt
what you need to improve upon
weather
unusual things that happened
flats/repairs on road

what helps you most when you look back on your log?
how often do you look back at your logbook?
what do you use for a logbook (computer, notebook, PDA)