Teaching Rule Blocking - Help!!

We are looking for ideas to aid in the teaching of the rules.
Any tips or techniques, ideas on teaching the rules.
Ideas other than the playbook.

We use a man-to-man scheme with a numbering system as the basis for all of our blocking. We number everyone begining at the center and working our way out. For example, in a 5-2 the nose would be 0 the linebackers would both be 1, DTs are 2, DEs 3. In any stack situation the man closest to the LOS has the lower number. Our center calls out and points at who our 0 or 1s are on each play. If there is no one on or over the center, as in a 4-4 there is no 0 man. The blocking assignments are as follows.

C blocks 0 or backside 1 (if there is no 0)
G blocks 1
T blocks 2
TE blocks 3

In addition to this we also have various calls that will alter our blocking. For example we might call a play that includes an ISO on a linebacker. Whomever is responsible for the LB then has a double team. There are many variations that can happen and calls that can be made (in fact, it rarely works out exactly as explained above) but when we talk about our blocking we always go back to the numbering system.

I also have used a system similar to what JD mentions. We called it GOL (Gap, On, Linebacker). If there is anyone in your inside gap block them, if not block the man on you, if neither of these exist block a linebacker. I think people are very successful with this, but I wasn't. It was someone else's plan and I didn't really buy into or understand the nuances of it and the adjustments that needed to be made. I was also new to coaching and foolish enough to think that you could have a rule that had no exceptions.

As with anything you have to believe in it and know how to teach it.