Lukas Smith has asked a question of the community with the release of PHP 5.3 coming nearer and nearer - who out there is using namespaces already?

As I said in my last post we are not yet sure if we need to make some changes to namespaces before we can move from alpha to beta in the current 5.3.0 release cycle. What I did not ask for explicitly is feedback from people that have already started developing code with namespaces. These people are likely the best source of feedback on the current state of namespaces and if the proposed changes to namespaces would be useful or not

He mentions that the Doctrine project is already playing with them and, apparently, some of his commentors - one using them on a library in development, porting over XJConf to use them and other various projects.