From: ted.dunning@gmail.com   
      
   Common words weighted by IDF as suggested by Yang should be your first   
   step, but if you decide to go the LSA route, you should definitely look   
   into a more current version of the same fundamental idea such as   
   probabilistic LSI (pLSI), latent Dirichlet allocation (LDA) or, most   
   recently, discrete component analysis (DCA or MDCA).   
      
   See Buntine and Jakelin's article for a unified view of this developing   
   field.  (http://cosco.hiit.fi/Articles/buntineBohinj.pdf)   
      
   See Blei, Ng and Jordan's article for the Berkeley orthodoxy.   
   (http://citeseer.ist.psu.edu/455140.html or   
   http://www.cs.berkeley.edu/~jordan/papers/blei03a.ps.gz)   
      
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