I recognised that here are many Threads with common problems, that are not mentioned at the FAQ, here some examples for new Questions:
I just want to help with that information.
PS: I don't know if redistributing older minecraftserver.jar's is allowed (even Alblaka considers it as allowed), because otherwise, theres no way to get them if you dont have a BackUp, like me. And these Versions are very often needed for all the Mods.
Edit: if someone doesn't read it, you can say that it stands in the FAQ. I also added a new Question-Answer.