1. Let’s say you just stumbled on a cool book (review, news item, friend’s suggestion, etc). But you’re already reading 3 other books, so you need to find a way to keep tabs on it
2. First check Amazon.com to see if other readers like it. It turns out Amazon reviews are very effective at this (the wisdom of the crowds FTW)
3. If reviews are positive (**1/2 or more), go to Gmail and write an email to yourself with the subject *Reading queue %book title%
4. Now create a filter named Reading Queue. Make sure it picks messages with “Reading queue” in the subject line AND that only messages sent from your email address
5. Every time you finish a book, click on the Reading Queue label in Gmail. Voilà! You can now pick from books you REALLY want to read, pre-selected, instead of buying books on impulse for $$$/forgetting about cool books you should be reading instead

Do you have other tips you’d like to contribute? Let’s hear it in the comments :)