Thanks for the post and suggestion. I have contemplated this approach in the past. What I've done at times was create an untimed, daily repeating event for the week on my Palm calendar app called "Plan for week", which contains those things from my various work-context lists (i.e. @office, @phone, @computer, etc.) that would give me the biggest return if they were completed.
Recently, I've kept the items within their respective lists, but given them a priority 1, and defaulted all others to a priority 3 or 5 (so that they're always below the 1's).
I agree that this avoids the requirements of having to re-think my way through my lists everytime I open them.