Do you think there could be a passthrough service for people to send raw transactions (made offline) via postalmail/skype/tor/twitter and then be transmitted on the network? Would be nice for countries that block internet during unrest etc.
Anything that can take a rawtx printed in some standard font (preferably one optimized for OCR) and printed on paper, accept it into a scanner and dump it straight to
https://blockchain.info/pushtx would do fine. An automated system could even feed the paper itself directly into a shredder afterwards.