Well you probably didn't install the mods correctly since Aether isn't updated for 1.0. Did you delete everything in your .minecraft or have you tried a force update?
I would recommend going to the MCP website for some basic tutorials that they have on adding blocks and what not. It is very helpful though and worth while to add Modloader in before you decompile your minecraft.jar.
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What is up with people like you and posting in the wrong sections? It isn't that hard.
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