This book is awesome.  I learned so much from it that I have placed it second on my list of books every software engineer should read.  There are so many great topics covered in such a easy to read and understand way that you can't help but want to try them out.  And after trying a few out, you start to wonder how on earth did you live without some of these things.  

There are a few books I have read that I really got a lot out of, and this was one of them.  I was familiar with a lot of the things discussed in here, but not at any great detail (at least with some of them).  I even learned a thing or two with perl (imagine that!).