Wandering on the opinion mining and sentiment analysis topic, I have discovered that Bing Liu, a referent on this topic, has posted his tutorial at the World Wide Web Conference 2008 at his home page. While the survey by Bo Pang and Lillian Lee for Foundations and Trends in Information Retrieval is a must, this stuff is (obviously) easier to read. Mi opinion :-D is first to read the tutorial slides, then the survey.
A good point with Bing Liu's stuff is that he has posted data at his Opinion Mining, Sentiment Analysis, and Opinion Spam Detection project. The data consists of (short) customer reviews of several products like cameras, routers, cell phones and so. This is an extract from the Linksys Router opinions:
router[+2]##This router does everything that it is supposed to do, so i dont really know how to talk that bad about it.
setup[+2], installation[+2] ##It was a very quick setup and installation, in fact the disc that it comes with pretty much makes sure you cant mess it up.
install[+3]##By no means do you have to be a tech junkie to be able to install it, just be able to put a CD in the computer and it tells you what to do.
Besides, Bing has worked on opinion spam!
As soon as I find the time, I will try to write a tutorial on how to train and test a baseline opinion classifier with WEKA.