well, it depends. The popular options are: 1) MacTeX for OSX, which is essentially TeX Live 2007. See http://tug.org/mactex/ 2) MiKTeX is the best for Windows system. proTeXt is an easy-to-install TeX distribution based on MiKTeX. TeX Live is also a good choice. See http://www.miktex.org/ 2) teTeX was the de facto implement on Linux till Thomas Esser decided to cease development of this distribution. He suggested user to join TeX Live at http://www.tug.org/texlive/ In conclusion, TeX Live might