From the press release:
Safari Books Online, the provider of digital libraries that increase the productivity of IT professionals, today announced an agreement with Packt Publishing to make Packt’s books and other technical publications available online to corporate and individual library subscribers. As Packt’s first online channel distribution partner, Safari Books Online is enabling its subscribers to benefit from access to one of the most comprehensive lists of copyrighted works on Open Source technologies.
Another reason to subscribe to Safari Books Online.