FreeCAD
Ok, first FreeCAD:
as they say themselves, it is still in the early stages of development. I have searched for documentation, and apart from the getstarted (http://sourceforge.net/apps/mediawiki/free-cad/index.php?title=Getting_started) there are 2 nice articles from December (so version 0.9, which btw. is in Lucid already). The funny thing is that for some reason, both are in... Polish! I understand you have polish origins, so maybe you speak Polish. Otherwise just google translate. They give you examples and a better idea of what it is right now capable of: http://www.ubucentrum.net/2009/12/rozpoczynamy-zabawe-z-freecad-krok-po.html http://wkupiesila.blogspot.com/2009/12/freecad-poznajemy-klawisz-f5.html
So I propose the following: you try to reproduce the steps in the articles, so you get a feeling for it. But then regardless stick with Blender a bit longer, and try FreeCAD again when version 0.11 or 0.12 comes out.
OSE FreeCAD Documentation
I have created a very simply, introductory guide to FreeCAD. It only covers the very basics at this point, but we can expand on it as needed. - User:Mjn