Research Observatory: For people who are wanting to learn Research Methodology or improve their skills.

Information Retrieval Utilities: Resources for people doing research on Information Retrieval. It contains useful data, like a list of stop-words in English language.

Multi-Interval Discretisation of Continuous-Valued Attributes for Classification Learning: Here is the link to the research paper that was written by Fayyad and Irani about discretising values falling in more than one class. It took me a long time to get hold of this research paper. It was rare for me to have come across this document.

331 Most Common Verbs in English Language: If you are working on an Information Retrieval algorithm, and require this list, just visit the link. Though the statistical reliability of this list is not established, but it does provide very useful list; at least, far better than the other websites, which may overload you with a very long list. This one seems quite succinct.