I have come across your forum, albeit a little "out of date"!
I am in Australia, so your Law is a little different to ours, but when I was in Scouts, I was taught the Law using a little rhyme. I have recently signed up to become a Scout Leader after being out of the movement for a number of years, and I found I immediately knew the Scout Law, because of the little rhyme.
Problem is, I cannot remember it all! After reading posts above, it seems to be based on a number of different mnemonic methods. What I do remember is below:
A Scout is...
1. Trustworthy (dont remember this on