Here's a smattering of articles I've collected, YMMV:

http://www.quora.com/What-is-it-like-to-be-a-professor

http://terrytao.wordpress.com/career-advice/work-hard/

http://matt-welsh.blogspot.com/2010/05/secret-lives-of-profe...

http://www.pgbovine.net/PhD-life.htm

http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjo...

http://web.mit.edu/krugman/www/howiwork.html

http://www.ams.org/notices/199701/comm-rota.pdf

http://matt.might.net/articles/books-papers-materials-for-gr...

And the classic:

http://www.cs.unc.edu/~azuma/hitch4.html

Good luck.

Thanks a bunch! I read most by now. Very interesting. Especially the Quora thread, because you get almost a discussion of several professors.