Hi,
While going through the written Shiny tutorial I've noticed that Lesson 6 is not fully up-to-date after changing the data source from Google Finance to Yahoo. The description itself is ok, but the linked app.R file still refers to Google inside helpText() and getSymbols(). The screenshot also shows the old version.
It's a very small thing, but I think it would be great to have everything up-to-date there 
Thanks in advance!
PS. Also, the linked app.R already contains the optimized version of the app (not the version described in the "Streamline computation" section)