What Is a Commonplace Book?

Essentially they are scrapbooks filled with items of every kind: quotes, letters, poems, photographs, drawings, excerpts of other books...for modern day usage they can include links to other blogs, videos, audio streams of interviews, talks and readings, and relevant articles. Additionally, I sometimes post my own thoughts, commentary, professional work (library or education related) and creative writing. However, once I complete my critical thesis, I mostly began using this site as an online notebook.

Wikipedia's entry on the commonplace book explains it well:
http://en.wikipedia.org/wiki/Commonplace_books

This post from the Beinecke Rare Books and Manuscripts library at Yale gives a good description og commonplace book and discusses the library's exhibition of their collection of commonplace books:
http://www.library.yale.edu/beinecke/compb.htm

This article from the Toronto Star covers an early commonplace book from the 15th century, though they characterize it as a precursor to Cosmo (???): http://www.thestar.com/news/gta/article/641640