The January 2012 issue of the FileMaker Technical Network's eNewsletter has a topic Learn to do more with "Let" which contains a link that doesn't work. I've tried it twice, on two different days and in both cases get a message that an error has occurred.
I'd like to communicate that problem with someone, but cannot find an e-mail contact listed anywhere in that email message.
Don may have had a Let-me-not,
I tried the link and it worked for me. Since it is a link to a thread in the forums you have to be logged in before it works.
Also, I had to download the document first as the link is not active inside the web document reader frame.