Adding even more to the huge namespaces debates going on, Padraic Brady has some of his opinions posted to his blog on the subject.
The problem isn't that namespaces are bad, it's that these arcane structures seem to have so little impact on development in PHP today for many many people. Does that mean it's unimportant?
He talks about the real value of namespaces, a comparison to type hinting's inclusion, the current amount of (needless?) traffic on the php.internals list and his opinions on why namespaces are valid.