Goodreads.com
If you or anyone else is interested… There are websites that help you keep track.
How I did it: In the notes/memo space in my dayplanner pages, I write the titles of books I read. I started this because once my pastor asked me how many books I'd read. I then started writing titles as I read them into a little memo book. When I got a planner, either in high school or upon entering college, I started writing them there. Then after college when I got a more traditional planner I started doing it the way I do it now. At the end of the month I count the number, and then I keep a simple tally in another section of my planner on a blank sheet.
Lessons & tips: Tips are: get a small notebook or an inexpensive day planner and then it's fairly simple to keep track of books you've read.
Resources: A small memo/notebook and a dayplanner.