Lists. Most of the time on Friday I review the projects from the week and start planning for the next week.
Helps to create this to-do list on a Friday while the status of your projects is fresh in your head. This also helps clear your mind for the weekend so you are not worried about this or that. Your tasks are already captured and planned so this can help you enjoy your weekend more.
Playing with new features in Google!!! Though it may seem unproductive to be messin around with new fun tools. .. It's actually very productive because Google apps always help me to be more efficient and of course totally productive!!