Cal Evans, a prominent member of the PHP community, has put together a new project sharing what he's called "Wisdom of the ElePHPant", a series of short thoughts by members of the PHP community touching on everything from the art of programming to helping out open source projects to working with code reviews.
All of these little nuggets of wisdom have been gathered and put into a small book, one per page. These books cannot be purchased but there are sources where you can find them and get a copy of your own (such as conferences, user groups or from various members of the PHP community). Fortunately, there was more than enough wisdom to go around and some of the submissions are also being shared on the site including current ones from Jeremy Kendall, Erika Heidi and Cal himself.
This is a great resource for some quick chunks of wisdom from developers who have seen (and overcome) a lot of the challenges developers experience every day. I highly suggest picking up a copy for yourself...if you can track one down. For more check out the project's main site, WisdomOfTheElePHPant.com.