1) The Answer to the Ultimate Question of Life the Universe and Everything
2) Library of Heidelberg University - a lot of stuff in open access.
3) Quantitative Finance - a new section of arXiv
4) How the credit crisis spread - physics arXiv blog
5) Origin of name "Cast Lead"
6) The Italian Man Who went to Malta - a funny video about English as a foreign language.
7) Defining Science - by Chad Orzel