I looked through the suggestion section and didn't see it so I really hope I am not bringing up something that was already covered.
I love the detector cables, but I was thinking. What if there was a detector cable that had a different redstone output on each face (or at least 3) depending on how much power is going through the wire? I would love to have something of this nature to see how much of a load there is on any given line. Say side #1 will activate if theres >=32eu/t, side #2 activates between 33eu/t and 128eu/t, and side #3 activates between 129eu/t and 512eu/t.