(especially liked the bit about the two degrees:)

You know you're a librarian when...
... you worry about punctuation
... you tell people to be quiet in bookshops
... you use acronyms more than you use real words
... you know what all the acronyms you use stand for
... people are amazed that you need two degrees to stamp books all day
... you read dictionaries for fun
... you know when you're breaking copyright law
... you've left your friends in the pub to go and look something up
... you can tell what someone is going to ask you by the look on their
face
... 245 00 $a makes perfect sense
... you have dreams/nightmares about Dewey
... you know what the last digit of an isbn is for
... you pride yourself on not conforming to stereotypes
... you smiled at at least two of the above
source:http://bluenettle.blogspot.com/2005/05/you-know-youre-librarian-when.html