When using Latex under Windows, TeXnicCenter and Miktex are my favorites at the moment. Although i consider Foxit PDF Reader a very good alternative instead of Acrobat Reader, Sumatra PDF supports some very neat features which are very useful when writing Latex Documents! When you click on a line in TexnicCenter, Sumatra jumps to the corresponding line in the PDF and vice versa (called forward/inverse-search).
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http://william.famille-blum.org/blog/static.php?page=static081010-000413