The main 2007 task differs from the 2006 task in that questions will be asked over both blog documents and newswire articles, rather than just newswire. A blog document is defined to be a blog post and its follow-up comments (a permalink). The blog collection contains well-formed English as well as badly-formed English and spam, and mining blogs for answers will introduce significant new challenges in at least two aspects that are very important for functional QA systems: 1) being able to handle language that is not well-formed, and 2) dealing with discourse structures that are more informal and less reliable than newswire.