Again, I really wonder if many people are missing the point here.
Please refer back to my original post on this thread, #72, which has since been referenced by #89.
Unless someone can reference proof to the otherwise, I believe that the only restriction GPL has over LGPL is if you are looking to provide something using Ext as a product rather than a service.
Using Ext on a hosted web site, either on the public Internet or a private Intranet - no additional requirements.
Taking that same application and making it available for others ("run this on your web site"), then your software must also be GPL, or the commercial license must be chosen.
(Ext team: This thread appears to be a run-away train. It'd be very helpful if you could create and post a FAQ based on the questions and assumptions from within this thread.)