Memorize, memorize and more memorize

I have 47 songs completely memorized. That's 47 songs in about 4 weeks. Now granted, about 15 of these songs I've been playing for years, but even so, they were never memorized. So for a guy who always believed I have the worst memory of any pianist in NYC, I'm really excited about my progress. I have had some help. A friend of mine learned Russian while in the Army about 20 years ago. His job was to intercept their military communications. Very hush, hush, top secret and all that cold war nonsense. But he had to learn Russian very rapidly and I asked him how he had done it. He steered me towards a book by Harry Lorayne which tries to give you skills in association. For instance: suppose you are learning French vocabulary and you are trying to memorize the word for Duck, which is canard (ka-nar). If you visualize, i mean really visualize "someone throwing a can hard, and you duck," you can create an association between the English and the french word. This book teaches that the more ridiculous the picture you create for your association, the easier it is to remember. Suppose you are trying to remember a list of seemingly unrelated items in order. You would associate each item with the previous item in some very ridiculous way. For instance, if you are associating the word airplane with tree, you might come up with a picture of a million trees flying through the air; or big jetliner landing in a small tree. Even though I'm not even half-way through this book, it has me thinking in ways I've never thought before, and I'm sure it's helping with my memorization of songs. The latest two songs on my piano are Hey There Delilah and Hurts So Good. I have 10 more days before I go down South to perform all of this music.