Don't use random.org. Someone might be sniffing your internet connection. The diceware method using actual dice is better.
We are talking about brainwallets
http://brainwallet.org, not randomly generated public/private key combinations.
Certain precautions apply:
1) Open the URL in safe mode
2) Disconnect from the internet
3) Make sure your random words include a few numbers/upper caps/random special characters
4) Should use at least 21 symbols, words only count as 3 (even if the word is longer than 3 letters).
5) Never use a phrase that can be found on the internet
6) Close browser before re-connecting computer to internet
I would feel safe with something like:
GotchaKeepingMilkPP*5!=100+20*
The 3 words count as 9 characters, then add 13 more for a total of 22.
My brainwallet is actually longer and more convulated.
I would also suggest a paper cheat sheet for yourself just in case you forget it, something like: GKM PP ** 5!=+
Now to modify for a set of brainwallets do this:
GotchaKeepingMilkPP*5!=100+20*(1)
GotchaKeepingMilkPP*5!=100+20*(2)
GotchaKeepingMilkPP*5!=100+20*(3)
GotchaKeepingMilkPP*5!=100+20*(4)
or use call signs
http://en.wikipedia.org/wiki/NATO_phonetic_alphabet for extra salt:
GotchaKeepingMilkPP*5!=100+20*(Alpha)
GotchaKeepingMilkPP*5!=100+20*(Bravo)
GotchaKeepingMilkPP*5!=100+20*(Charlie)
GotchaKeepingMilkPP*5!=100+20*(Delta)
GotchaKeepingMilkPP*5!=100+20*(Echo)