A number of links related to natural language processing and linguistics:

• What’s the Difference Between Stemming and Lemmatization? – Ask Dr. Search
• A List of Social Tagging Datasets Made Available for Research
• Social Signaling and Language Use
• Lexical Growth in the Blogosphere
• Spelling correction using the Python Natural Language Toolkit (nltk)
• OPUS – an open source parallel corpus
• Evaluating POS Taggers: The Contenders
• Text Analytics Wiki