Have you ever wanted a tool that can identify the part of speech for each word in a sentence?  Today's find is the "stanford-postagger" tool. This nice tool lets you type or copy and paste any text into a textbox, and then it will tag each word with its part of speech. 

The tool is based off of the Penn Treebank tag set.
The tag set is the key for the tags. For example, DT
has been assigned to both the words 'this' and 'a' in the image. The tag set identifies DT as a determiner.

Well, you get the idea.  Here are some links if you care to follow-up on this.

Update: The link seems to be down now so you may have to Google search.
The tool: http://nlp.stanford.edu/software/tagger.shtml#Questions
The tag set:  http://www.clips.ua.ac.be/pages/mbsp-tags
An online version: https://open.xerox.com/Services/fst-nlp-tools/Consume/Part%20of%20Speech%20Tagging%20%28Standard%29-178