I think blogging on a schedule has merit. If I were doing anything else business related on a schedule it would imply improved quality (better focus, earlier shipping times, etc.). I try to have the same focus when it comes to blogging, and thought I admit I've posted a few dull ones here and there I think the schedule ultimately helps me remember that this is something important to me. Otherwise I'd just post whenever I felt like it, and it would quickly cease to be a priority.
Do any other bloggers keep to a schedule? Any that don't?