@atila77: I'm very interested with pyqtoreader, and I'll be happy if you give me an idea about some points :
* How fast can pytoreader render html ? Responsiveness is a Major requirement in this project.
* Should I use pure python to write a module ? Can I trust python as a language for a fast eBook engine ?
* Honestly I'm not convinced about writing a plug-in, then optimizing the core, this approach may not be as easy and straightforward as starting from zero with speed in mind.

@Lord Raiden: I will be pleased to get some UI ideas, I'll contact you once I've decided how to go ...