@kaik: I don't know what kind of snake it was. It was not a 'czarna zmija' but there seem to be several different types of zmija here in Poland. We also have another black snake that is harmless, but I can recognize that because it has large yellow markings on the back of its head. In general, I treat snakes and spiders the same - with respect.
If the spider is in my house and it is not too scary looking, I'll capture it and put it outside. If it falls into the scary category, I call my wife and she takes care of it.
Our yard is actually getting fairly sterile at this point, but it is because of the dogs. I try to leave piles of branches and stuff around to give the lizards a chance. My smallest dog takes care of all the mice, moles, etc. If I happen to see something before they do, I'll put it outside the fence (with a kind warning not to come back) so it has some chance.