I'm using it in all my C++ projects (even in the proprietary ones) and it works very well. The library really simplifies programming, taking care of portability and everyday tasks.
Different modules of Boost library are becoming part of C++ Standard because they:
* are carefully designed
* work as fast as possible (and it's really fast!)
* are widely usable
* are handy
* are portable (Linux, Windows, MacOS, Androind...)
Boost is perfect for server and game development and is very useful in all other cases.
Official site contains a lot of docs and there is a bunch of books about the Boost all around the Internet. Find you favorite library, enjoy programming!