As resource room teachers, we do not have a curriculum to guide our lessons - we have IEP's. In order to write focused lessons, you need to keep the IEP goals in mind while planning. I have recently created a quick and easy form in Word to keep track of them. I create a table for each student. The first column holds all of the goals. I have 15 boxes next to each goal for checkmarks/dates. Each time I write a lesson pertaining to a goal, check it off or write the date in the box. That way you make sure that you are focusing on each goal evenly. I fit 5 students on 1 page (some kids only have a few goals, others had a lot). I also added some cute graphics/fonts to make the form attractive. I use this is my curriculum. It focuses my lessons and makes it easier to plan.
As I've mentioned before (I think...), I also create an "At-a-Glance" sheet outlining each child's IEP. Last year I made index cards for each student for Test Modifications. Having these items on my desk allows substitutes/paraprofessionals to easily see what needs to be done if I'm not there.
I hope this helps you stay organized and focused!