Looks like RFID has some annoying applications in terms of privacy reduction. But privacy is a matter of identity, and identity is difficult to determine - or, at least it can be made difficult to determine.
Build a small reader that monitors RFIDs close to either you or a local Starbucks, broadcast these via a p2p wireless mesh, and return a random sampling of this identity stream whenever a reader queries for IDs. Perhaps store a stream of RFID responses in a memory stick for those times you are not near a wireless 'freedom zone'.
Are citizens banned from creating new RFID applications yet?
Oh.. it looks like RSA already thought of jamming.