Very Nice Library!
In the time it took me to get Boost and ACE* compiled and usable as plugin libraries I was able to make a controlled document webserver application complete with view/update/tracking/collaboration capabilities using PTypes library that works in a diverse network environment for proof of concept.
This is definitely a library that will be a main stay in my own personal toolbox!
*I am not being critical of Boost, ACE, or STL as I have used them extensively and they are great libraries. My point is PTypes is one of the first truly plug it and go with code bases I have come across in a long time with such a gentle learning curve/functionality ratio. Awesome library.
This is a very nice codebase. It has a clean interface and very easy to "pick up" on without a lot of hassle. I have found this library useful for my toolbox.