"If you file more than 100 returns for tax year 2010, you are required to e-file. If you sign a return and the client chooses to mail it, then form 8948 must be filled out and attached to the return. If the client does not include the signed form 8948, that return will not be in compliance. The enforcement rules are still being drafted, but will be retroactive to Jan 1, 2011."
Form 8948 is not signed by anybody.
taxbilly