I finally took the plunge. I downloaded a password manager.
Until now, I've either remembered my passwords, used some algorithm to determine them on a per-website basis, or tracked them in my emails. All of those had shortcomings, so I decided to try a password manager.
Using no particular criteria, I devided to try Revelation. Simple, to the point, and for the handful of days I've used it, it's gotten the job done. Using a password manager has its own shortcomings, but having to look up a password in a single application beats trying to find passwords in my email or guess until my account is locked.