This lovely little story won the Hugo Award in 2007. It's about a man who wanders into a video store from an alternate universe for a short time. Enjoy!
http://web.archive.org/web/20070422075939/http://www.asimovs.com/_issue_0704/Impossibledreams.shtml
http://web.archive.org/web/20070422075939/http://www.asimovs.com/_issue_0704/Impossibledreams.shtml