Just fyi, since I know that I often have trouble sticking to the character limit, and we often want to post links to things that have really long URLs, if you're not familiar with bit.ly, it's a website that will shorten URLs for you:
http://bit.ly
So for instance, you could have this URL: http://www.amazon.com/gp/search/ref=sr_nr_p_76_0?rh=n:1055398,k:kettle,n:!1063498,n:361395011,p_76:1249154011&bbn=361395011&keywords=kettle&ie=UTF8&qid=1269110190&rnid=1249153011
BUT, you go to bit.ly & plug it in and you get: http://bit.ly/a1a1zD
And they go the same place in WAY fewer characters. 
(Can you tell I have small home appliances on the brain? :p )