Here are a few websites you may find interesting; I'll update from time to time as I come across more:
Puget Sound - Boeing Test Flights Blog
The latest on Boeing Test Flights in the Puget Sound area of Seattle WA. Reports will cover first flights & deliveries where possible from Renton, Boeing Field & Paine Field.
http://www.lh-taufnamen.de/lufthansa/
Fleet information for Lufthansa as well as Germanwings, Swiss & Austrian.
United Airlines Fleet Information
Full and complete database of all United (incl. Continental) aircraft, status of refurbishments, upgrades, fleet numbers etc. A great resource for UA fleet info.
Paine Field Blog
All the latest and greatest from the Boeing factory; photos and video updates of new build aircraft first flights, delivery status and more.
Little Known Texas Airfields
Great history on Greater Southwest Airport, DFW's predecessor!
The QANTAS Source
Fun little site with QANTAS rumors, gossip and other info.