App_Data, App_Code, App_Themes, and App_GlobalResources – we’ve come to love them over the years.
I was hoping the team could add a few more “special” folders to ASP.NET, but I don't think these will make it ...
App_Store – drop in an xml file with product descriptions and … presto! Instant e-commerce!
App_etizers – content you serve customers before they get to the main part of the site.
App_liances – will work with Azure, because cloud computing needs appliances.
App_endix – I'm not sure what this would do, actually. Perhaps I should remove it.