I have come across your forum, albeit a little "out of date"!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 one!) 
2. Loyal (picture 2 L's as 2 Hockey Sticks) 
3. Helpful (3 little words - "May I Help?") 
4. Friendly (F for Four, F for Friendly) 
5. Cheerful (Number 5 on its side looks like a smile) 
6. Considerate (Convict Number 6 Named Sid) 
7. Thrifty (Don't remember this one either!) 
8. Courageous (Don't remember this one, but thinking maybe 8 looks like a B for Brave?) 
9. Respectful (Number 9 looks like it is bowing) 
10. A Scout Cares for the Environment (Picture a large red X on a tree, like trees that have been marked for logging - X being the Roman Numeral for 10) 
  
Worked for me! And I would like to teach it to the Scouts here, but cannot remember the rhymes for 1, 7 and 8... 
Tried googling it with no luck - that's how I stumbled upon your forum! 
If anyone has any ideas, I would appreciate it!  
  
Thanks,  
Akuna