Sentiment Analysis - Natural Language Processing

I have always been interested in Natural Language Processing tools, but with the recent purchase of Topsy by Apple, I wanted to do some research and find out available tools. To my great surprise there are great tools out there, that makes sentiment analysis pretty easy, and the biggest of all is Python library Natural Language Tool Kit, aka NLTK. parses, tags and reconstructs texts so that machines can understand the sentiment behind each statement. Here is a great video tutorial on how to install and do a test run with NLTK:

https://www.youtube.com/playlist?list=PLQVvvaa0QuDfRO5bQFLcVgvIOIhNUZpZf

It is composed of 26 videos, each about 10 mins long. The presenter does a great giving you just what you need to know. Check it out!