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The issue with that idea is that you have to be 100% confident that Trucrypt does not leave behind artifacts that point to the non-dummy partitions, including things like "recently accessed documents" or indices created by the OS to speed up document/file searching.

You have plausible deniability for any single disk (assuming their is no info leak through other channels, (and possibly technicalities with TrueCrypt). However, you will have a difficult time claiming that they are all random, especially because you would be set up to run TrueCrypt.

The best approach I have heard is to have 2 TrueCrypt volumes, but claim you only have 1. You still have to be careful about data leaks, and making your 'one' look convincing.

Also, yes, you cannot be forced to give them your decryption keys.

You don't have to decrypt anything no matter what. You can't be compelled to give up the key.

... unless you're in guantanamo bay