There are a number of online resources that contain information about the Anthropic Principle and related discussions.
Nick Bostom's homepage contains Nick's related papers, as well as papers on a variety of other topics.
simulation-argument.com contains resources specifically related to the argument that the Universe is, in fact, merely a simulation being carried out in the 'real' Universe.
The Future of Humanity Institute, directed by Nick Bostrum, is a cross-disciplinary research centre of the University of Oxford that unites philosophy, science, and mathematics to tackle the large questions of where humanity is headed.
Similarly, the Cornell University's arXiv is a preprint resource for papers in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics, and contains some scientific papers about the Principle.
Finally, anthropic-principle.com used to hold a preprint archive for papers related to Anthropic Bias. Although the archive is no longer maintained, you can see the final collection here.