Dedicating yourself to a project weekly means you don't have to switch contexts. I wake up in the morning, get myself ready and then I start on the tasks for a weekly project. I don't have to decide what clients gets my priority today, I just work on the project for the week.

— Weekly Pricing for Web Development by Curtis McHale

I love this idea. Basically it amounts to charging for iterations or sprints. Nice to see Curtis picked up on my task switching post as well.

I can afford to lose some time during the day as I am working with mostly one client at the moment on a number of their applications, so a little lost time is to be expected.