Here are some links for LDA. I'll be using slides created by Professor David Blei. mlss09uk_blei_tm.pdf His lecture using these slides is video-taped and is excellent. Here's a link http://videolectures.net/mlss09uk_blei_tm/
Here are several other sources that flesh out various aspects of topic modeling
We'll also talk about Dirichlet distributions. The wikipedia page for Dirichlet distribution is very helpful for getting a feel on these distributions. http://en.wikipedia.org/wiki/Dirichlet_distribution . Here's a paper that covers different aspects of the Dirichlet. minka-dirichletEst.pdf
Here are links to some of the code that I ran in class.