I use the creel we made on Flyangler.ca. It tracks species, caught and relesed, dates waters etc.. I put in notes about the conditions and flies used and refference it when I go back. It's handy and I can access it from anywhere. If you have GPS co-ords, you can add them to track it on the google map as well.
http://flyangler.ca/index.php?option=com_creel&Itemid=39