Maybe I am a bit late to reply, but there is a great combination of techniques which take a good few months to perfect but definitely helped me in work and life over the last 20 years and have redone the course a couple of time to refresh / relearn the techniques.
Whatever method you choose there will be differences and each person will have a preference. Tony Buzan, Nicholas Boothman and others have techniques which can work very well. I feel that Dr. Furst works at a fundamental level which is designed to work at two distinct levels and combines concentration and recall.
1. The numbers principally are linked to the 10 main sounds used for most words. These are 0-9.
2. Numbers (and so sounds) in combination are used to create words. The use of Ten sounds are used to build word so you can always remember the words you need.
3. The hook & peg principle is also used so that as you count 1,2,3,4,5,6,7,8,9, etc initially single syllable words tea, noah, may, ray, law,key, fee, pea. (toes, tot, tan, tam, tar, tail, tack, toffee, tap, tissue are 10 - 19, two syllables etc). Building the association is key.
4. The use of imagery is also fundamental to recall. Make the image easy to remember using an enlarged or unusual image or scenario making thins easy to remember.
5. Concentration exercises build recall though focus on a wider picture, remembering it and refering to the image later for the details you need.
Examples use in the programme are to remember your shopping list or the order of cards in a deck. It is an older methodology initially from 1960's which I think so feel it has been ignored by many especially as Paul McKennas and Derren Brown who also combine an good understanding of people skills, NLP and other mind hacking techniques.