On my board I have the following lists:

2015 Week N | Now | Today | Tomorrow | Week | Month

Long-term work items originate in the month list, and get moved left as time progresses. Obviously as items come up they can be input whenever is appropriate.

At the end of the week, 2015 Week N is archived (I actually move it to another board), and a new week is created to cover the next week's completed work.

This setup pressures me into meeting my commitments, and allows me to feel accomplished by looking at the previously completed weeks.