Easy measure: make all acronyms at least four letters long. I pick the number four because three-letter acronyms usually have many associated Wikipedia articles, while four-letter acronyms usually have at most one.
Amusingly, the obvious (in my mind) abbreviation for "four-letter acronym" conflicts with a certain free lossless audio codec.
The usual abbreviation for "four-letter abbreviation" is "ETLA".
I posted this in the comments at Eric Raymond's blog:
Then I realized some here may find it useful.
Extensive use of abbreviations and acronyms was primarily a convenience for writers, when writing was done by hand and then by typewriter, there is less justification for it now when most writing is done by computer. And as my comment points out it is usually a negative for readers. It does benefit readers when you can convert a long phrase into a readable word, SCUBA and LASER spring to mind, but that doesn't occur often.