Yeh, I know there's a separate topic for this but it'll get lost in all the other conversations.
When you put your mod into a zip archive why don't you name the folder what it's supposed to be named?
eg: the folder in Simple Mobs is called "PilzAdam-mobs-c49cc47" and it needs to be renamed to "mobs" before it'll work. Why isn't it named "mobs" inside the archive in the first place? Might save a lot of newbie stuff ups like mine.
The archive could still be named "PilzAdam-mobs-c49cc47.zip" but the folder inside should be named correctly.
Cheers,
Andrew.