First thing Monday morning is when I go through things:

1. audit the last week - what you had planned, what you achieved and did not, why?
2. preview the coming week - any tasks that MUST finish on a day during the week, any appointments?
3. check project lists - run through all your project lists to determine any _next items
4. check goals - are these still achievable, any new goals, any goals achieved?
5. talk to people - for any tasks that you have delegated, tell them!

Any system, be it GTD or no, is going to fail at some point and simple act as a means to jot down your tasks but not a system to help to Get Things Done on your task….