If you must bill by the hour ...

Here’s a cool utility that could help you recapture some of that lost time.  From the TimeSnapper website:

With TimeSnapper you can play back your week just like a movie. You can play it at any speed you like, and jump in at any time you like.

When it's time to fill out that dreaded timesheet, TimeSnapper is a savior. No need to tear your hair out trying to remember where all the time went.

Via Lifehacker.