I have one. This past saturday I went to my local library and got my very own library card. The librarian was very helpful with all my questions (what are late fees, what are other policies I should be aware of, etc.). It was rather exciting to have a library card again, probably because I always enjoyed going to the library as a kid.
I really don't know why I haven't gotten a library card over these past five years. When I first moved to Boston for grad school, I read too many textbooks to be interested in leisure reading. Then when I moved into the working world, I started a library within my work and all the people from my department dontated their old books to share with others in the office. I would occiassionally buy books to fill in ones I wanted to read, that no one from my office owned yet.
Now that I have read all the books in my work "library", I made it a goal of mine to get a library card this year. The money I save from not buying any new books will be set aside and saved and at the end of the year I plan on donating it to a cause. Plus if money is tight, and you are trying to cut down on your expenses, it's FREE! Provided of course you return your books on time.
Additionally, the cool thing about getting a Minuteman Libray card is you can use it in 35 other community libraries. From Acton to Woburn, my free little card will let me read to my hearts content. You can even return a book you got from one library in the Minuteman libray network to another libray in the network.
If you don't have a library card, what are you waiting for?