If you use LaTeX on Windows, or in particular
pdflatex, you must have noticed that viewing the resulting PDF file is not as easy as you would think.
Sure, Adobe Reader displays it fine. But apart from being bloatware and slow as hell, it also locks the PDF file it is displaying. Thus you cannot rerun
pdflatex until you close the file in Reader, because the output file cannot be overwritten. This is a pain in the arse.
Foxit Reader seems like a decent alternative; it is much faster and less bloated than Adobe Reader (even though the installer tries to get you hooked on several other pieces of software that you probably don't want). Foxit does not lock the currently viewed file; however, it offers no reload option, and if you overwrite the output file, it will only display blank pages for what's not currently cached.
Enter Sumatra PDF. A very lightweight and very simple program, contained in a single executable file, written by a single developer, but it has the one killer feature that LaTeX authors need. It automatically reloads the PDF file whenever it changes. And it stays on the same place in the document while it does this.
There is currently a bug that causes the window to demaximize when it reloads, but you can work around that simply by not maximizing the window in the first place. This little viewer will definitely make my life easier.