I heard a cool idea from an attendee of Devscovery last week. He said that his wife is a consultant who switches tasks throughout the day. Like most consultants, we have a hard time remembering what we did (or didn’t do) throughout the day.
Their answer is to just run a screen-capture program like Camtasia or something like it, and configure it to shoot a snapshot every 5 minutes or so. This way you can play back at the end of the day and have a semi-recollection of what you’ve done!