Face detection and face recognition in 2D and 3D

At the moment I'm looking for libraries, that support face detection and face recognition implemented in C++, C or Java.
Beside that, I'm looking for information about the algorithms.

Writing plugins in C++ - pugg (open source c++ plug-in framework)

I am looking for people that have experience in using, or interessted in using, the plugin framework pugg, available at:
http://pugg.sourceforge.net/

What is your opinion on the framework pugg?
Please feel free to leave a comment.

Edit 2010-02-25:
I decided not to use the framework pugg.
In my opinion the framework is inconsistent, because one plugin can support more than one functionality.
I need a plugin framework, that only allows plugins with one "run()"-method.

Plugins in C++

I am looking forward to write a software that defines a plugin interface.
The main functionality will be defined by each interface definition.

Afterwards I would like to configurate the software by XML files. Then by the entries of the XML file, a specified plugin will be used to process the data.

By this way it is possible to create a modular system.
I would like to define different filter interface (I call the plugins filter, because data will be processed) for the different tasks that will be needed.