Has anyone found a way to incorporate GTD for keeping track of client hours and billing. I am an accountant and, just like lawyers, need to send out invoices to my clients where I bill them at an hourly rate and the invoice details all the work that we are billing for. I would like to be able to choose a client, either on the page or on the computer, and be able to see everything I have done for that client. Do I make that client a project? Any ideas would be helpful.