Example of good PHP namespace usage?

All,

I want to start using PHP namespaces for my projects.  Currently, I name 
my classes similar to how Zend Framework names theirs and I end up with 
classes like:

   LS_Util_String

I'm thinking that if I converted this to namespaces, the classes would 
be named like:

   LS\Util\String

I'd like to look at an example of an open source project that has 
already adopted namespaces as "the way to do it" and would be a good 
best practices case for how I should go about setting up my library 
namespaces.

I have been playing with concepts of using a Java-like naming convention 
for classes and have created my own namespace like:

     com\larkspark\util\String

And here I was thinking that packages would be lowercase and classes 
would be camelcase with initial caps.

I'm getting ready to build a new project and wanted to do it in the 
future-forward style while removing legacy classes and refactoring 
everything to use namespaces.

Any examples out there?  Everything I find from searching Google is 
novice intro to PHP namespaces blogs, but nothing concrete.  Also since 
namespaces are relatively new, I see a lot of misleading guides where 
they are using "::" instead of "\" to separate class name parts.  What 
does this list recommend?

Dante