Well yesterday I went Christmas shopping - I'm definitely not much of a shopper but Lisa and I try to make things fun... and I will admit that it was fun.

Some good info on crawlers -
http://www.clickz.com/experts/search/results/article.php/3624017

Matt Cutts (the Google Guy) on some mistakes to avoid -
http://www.mattcutts.com/blog/2006-pubcon-in-vegas-thursday-site-reviews/

Some excellent info on social search - how it's manipulated.
http://www.niallkennedy.com/blog/archives/2006/11/spam-farms-social-web.html