This is an awesomely cool resource: ELF: Your Personal Library Reminder Service.
If you sign up for their service, you'll receive regular emails telling you what you have out on your card, what's due when, and the status of any holds, inter-library loans, or inner-library loans. It's especially handy for heavy borrowers like me. It's also handy for patrons with multiple cards. (We have a total of nine library cards - one for each family member.)
Thanks to Adrienne for introducing me to this website!