If you want to try out apps on Google Chrome's Web Store, you have to download/install them and only then do you get to try them. But Venkat at Techdows discovered a neat trick for users of Chrome Beta, Dev, or Canary users that lets you launch apps without installing.
via Web News Blogs http://lifehacker.com/try-chrome-apps-without-installing-them-in-chrome-beta-1469694791