PIN is the only acronym you listed. the others are initialisms (acronyms sound like a word, initialisms are spelled out). in the u.s. we aren't only redundant with abbreviations. "the hoi polloi" means "the the masses," "lukewarm" means "warm warm." if you're interested, KBPS out of san diego has a show called "a way with words" (and it's podcasted!) and they talked in their last episode about these kinds of redundancies. google it, i can't post links here.

That is hilarious.

um, jessica schooled you sucka!

Thank you Scott for this nice article, but I cannot resist :
Jessica, there are also mixtures of initialisms and acronyms: CD-ROM (Wikipedia wrongly refers to it being an initialism), jpeg
But I don't know of any suffering from what should now be referred to as the RI&AS syndrome ! Unless we keep RAS syndrome, with A standing for Abbreviation, what would cover both Initialisms and Acronyms...

Whether the redundant word follows an acronym or an initialism, the point is that there is a redundancy at all! And whether you call it ARS or RAS, it's still about the redundant use of the word following (usually) the acronym. ARS is one of my personal peeves, so much so that I have my own website devoted to it. http://ARSSyndrome.info. Ironically, being a Joomla advocate, I hadn't even thought to add CMS System to my list! Feel free to visit my site and submit anymore you come across!