This looks really intersting. After reading a few of the posts it sounds as though it takes up a lot of memory. Also, it doesn't run on Mac which rules out most of my computers. Only my laptop is a PC and I'm not sure if I want to get it bogged down. I'm not super computer saavy so if I've misread this let me know. Also, it doesn't have NCL, which is our favorite line.
I know that Kayak lets you sign up for price alerts on airlines. I'm not sure about cruises.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Alaska 2014 - haven't picked a cruise yet
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, Caribbean 2013