[tonyarkles]

I use a mix of Toggl and org-mode, to solve the exact problem you're describing (some clients need detailed information).

I'd probably just use org-mode, but I also have a subcontractor that I need to bill for as well. The toggl reports tell me exactly how much to invoice at the end of the month for the both of us, and my org-mode files have all the nitty gritty details of what I've worked on.