Worst programming book? Easy, it's this one:

Learn OLE DB Development With Visual C++ 6.0

http://www.amazon.com/Learn-OLE-Development-With-Visual/dp/1...

I bought this back in like 2000-2001 or so, when I was doing a lot of C++ programming on Windows, and needed to do some work with ADO and OLEDB. Uuuugggghhh...

My review on Amazon from back then still pretty much reflects how I feel about this book:

Before buying this book, I was a little angry about the lack ofquality documentation on using OLE DB and ADO in C++. After buyingthis book, I am STILL angry about the lack of quality documentation on using OLE DB and ADO in C++, AND I'm angry about being out the bucks I spent on it. This book misses the mark on (what I took to be) it's intended audience, badly. Hardly a book for a beginner to learn the subject, it's just a rehash of reference material available elsewhere. Why, oh why, does Amazon not have a rating of 0 stars for these reviews? END

My worst one was "Build Your Own Ajax Web Applications"

http://www.amazon.com/Build-Your-Own-Ajax-Applications/dp/09...

I got it at a used book store for $5. The second chapter was page after page of code to build an app to be used for the rest of the book. None of it was explained, and of course it didn't work for me and I didn't know if I'd made a typo or if it was just outdated. The book promised that the code would be available online, but the website was defunct. It ended up in the garbage at the end of the school year.