Professor Lessig wants your help on behalf of the public domain.  He’s got a few specific requests, which include spreading the word about the proposed act (still in its nascent stages) and writing to your Congressman and Senators (yes, it’s quaint, but yes, it does matter).  In case you want a little help in drafting your correspondence, Derek Slater has made it easy for you.  (Derek’s work, I’ve found, is eminently trustworthy, FWIW.)