Like a lot of people here, I have a lot of nostalgia for my oldschool CRC handbook. I have many fond memories of poring over its extensive listings of mathematical formulas and scientific tables.
But in a Slashdot discussion of nostalgia over the Chemical Rubber Company, we should not forget the MathWorld debacle. MathWorld was an online math encyclopedia in the mid 90s. It was one of the earliest proofs of the power of the web's collaborative processes for publishing, predating Wikipedia by almost a decade. It started out as Eric's Treasure Troves, hosted by Eric Weisstein on his UVA account page when he was an undergraduate. But with hundreds of submissions by collaborators, it grew into a comprehensive listing of almost any branch of mathematics, a resource which many math students relied on on a daily basis. It eventually got a book deal, and was published into a paper encyclopedia by CRC. After publication, CRC decided that the ongoing web resource infringed its copyright, and shut it down, including content that had never been part of the published work.
Eventually a deal was reached between Weisstein/Wolfram and CRC and the website was restored, but the damage had been done. MathWorld would never recover its status as the premier home on the web of mathematical knowledge. The MathWorld community was shattered and a new GPLed math encyclopedia was started, PlanetMath. And eventually in the mid 2000s Wikipedia exploded, including much mathematical content. CRC's reactions was one of the earliest and most egregious examples of old media companies responding to the rise of the internet in the worst way possible. CRC should no longer be regarded as responsible stewarts of mathematical knowledge.