That was fast... A few days back I wrote about http://www.tripalertz.com/ offering a generous $10 trip cash referral bonus per friend that signs up. Now they are only offering $1! The trip cash earned had a 2 year expiration which now has been changed to only 1 year. The referral bonus is only good on vacation packages so I am betting that most of the money earned will never get used.
If you still want to sign up, here is my referral link http://www.tripalertz.com/pages/curtain/?friend_u=10974