I use the following for airliner info:
Marc Schaeffer's pages:
http://www.surf.to/orders Latest airliner orders and order rumours.
http://www.surf.to/com Home page, with very interesting airliner links.
http://www.chicago.com/airliners Great site. I like the chat, and archives. Lots of links, including Schaeffer's pages, great circle routing distance, airframe and propulsion info, etc.
http://www.awgnet.com Aviation week site, I only look at the daily news part - this doesn't need a subscription.
http://www.aeroworld.net New issues every monday. Also, they have archived their Paris Air Show issues, which they published every day of the show this year.
Hope all this helps.