I have found a quite interesting shakespearean article about Liskov Substitution Principle. It is mainly about C++, but being it the core of Object Oriented paradigm I think that it might be interesting for everyone.
Most of the think is nowadays resolved with mixins and Policy Based Design, but they run away a bit from pure Objects Oriented and so is still an interesting reflection
So if you are interested take a look at this Blog Post
FlyPDF the multi-language PDF generation library we develop in collaboration with OS3 now has C# (.Net) support bindings. Also improvements have been made to the C bindings implementing callbacks to override default header and footer generation. Also the Write method for flowing text has been made available to all the language bindings including C++ and Python.
Also Fabio Rotondo from OS3 had a speech about FlyPDF at the Italian PyCon which had quite a big success.