I do know about memoize. It must have been one of the very first modules I ever discovered - I seem to remember having read about it in an article. Generally I prefer to do memoizing by myself: don't know why and couldn't give any good reason - generally I'm not terribly concerned about efficiency, especially micro-optimization-wise.

I must admit, however, that for some other reason I couldn't say, I had never thought of using it on (subs called like) methods.