Ditto to what Lucky said.
Throughout the years, I've been successful using these exact same memorization techniques.

As an added comment: I find that when I'm memorizing something (lyrics, chord progression, etc), that if I work on this close to retiring for the night, that when I wake up, I have it far better memorized than by constant repetition. As Lucky said, there is something about the breaks between practicing which gives your conscious mind a rest, while allowing your subconscious time to process and cement the information in your memory. Ther've been many instances where I've unsuccessfully attempted to memorize a song late at night, but the next day, surprised to find I'm able to play the song perfectly without fail.

In addition, I do know that as you memorize more & more songs, that the memorization process time becomes a lot quicker. - Scott

[This message has been edited by Scottyee (edited 11-06-2010).]