Google uses pretty much all of their own products internally. Notably, the corporate version of gmail, and Google Calendar. Here's a cite: http://blogoscoped.c

Google uses pretty much all of their own products internally. Notably, the corporate version of gmail, and Google Calendar. Here's a cite: http://blogoscoped.com/archive/2008-03-12-n39.html http://blogoscoped.com/archive/2008-03-12-n39.html