The Exception model

http://blogs.msdn.com/cbrumme/archive/2003/10/01/51524.aspx

Sharepoint UI stuff

http://www.devexpertise.com/2009/02/18/integrating-a-custom-aspnet-application-into-sharepoint-part-1/ - file org/deploy
http://www.devexpertise.com/2009/02/25/integrating-a-custom-aspnet-application-into-sharepoint-part-2/ - security/UI
http://www.devexpertise.com/2009/03/04/integrating-a-custom-aspnet-application-into-sharepoint-part-3/ - Navigation
http://www.devexpertise.com/2009/04/01/integrating-a-custom-aspnet-application-into-sharepoint-part-4/ - features/wsp

http://karinebosch.wordpress.com/sharepoint-controls/ -WSSUC