I thought I'd posted this somewhere before, but can't find it. I have literally thousands like this - "On December 30, 2008 I celebrated my 86th birthday. Earlier this month on December 1st, I put on a memory program for the Peachtree Corners Rotary Club, Norcross, Ga., and in my presentation I used over 2,000 numbers, all 159 Counties of the State of Georgia and County seats of each county (largest in population to the smallest), 6 decks of playing cards, and 3 different editions of TIME magazines. Thanks Harry for your contribution to my life. Since learning and using your memory-training techniques I have been able to accomplish this feat.
Ben C. Robertson"
I also posted somewhere someone's letter to the NY Times (don't know if they ever used it), anyway I'll paraphrase him -
"Writing about memory training and not mentioning Harry Lorayne is like writing about the theory of relativity without mentioning Albert Einstein!" (I think it also shows a lack of knowledge - or perhaps stealers don't want to mention from whom they steal?)