What travel sites should you sign up for to find travel deals?

I always get asked what sites I use to get insider tips and save money.  Here's my list of sites in no particular order.  Note sign up for their newsletters on these sites.

General travel info

• http://smartertravel.com   - for instance today there is an article on the best time to book a cruise to get the most  percentage savings. 
• travelzoo.com - it will provide the top 20 deals each week. They scan the web for you for any type of travel - cruises, flights, tours, etc, 

Cruise travel deals:

• Sign up to offers from your favourite cruise lines. 
• Crucon outlets - crucon.com.  Its a US site but only sells cruises so in addition to good pricing (even with the cdn to US exchange rate). I saved 50% on an upcoming cruise and got a $200 OBC (on board credit).
• Cruise Critic - cruisecritic.com is one of the best places for info on ports, reviews of ships etc.  and if you sign up for the weekly deals its a good starting point for finding the best deal.
• Expedia.ca is easy to use but not necessarily the best price and they tend not to have the most in OBC.
• Cruiseline.com - again good for reviews, deals, newsletters.

Airline sites:

• Hopper.com 
• Flighthub.com
• Karen can you add to this list?