With all of the questions and opinions flying around about namespace support in PHP these days, it'd be nice to have a one-sto-shop kind of place to find out all that there is to know. Well, apparently someone else though so too - and set up php:namespaces, a Wiki devoted to the topic.
The wiki already has some of the basic content filled out - examples, the mailing list address, and the patch/patched versions that include support for them.
There's also a few other related links to other resources dealing with namespaces and other future feature ideas for PHP, so be sure to check them out as well.
Of course, being a wiki, you can go over and contribute as much as you want!
Many thanks to Aaron for the pointer...