anonymousspeech is offshore of the US and Europe and doesn't comply with any subpoena
Anonymousspeech is in Japan. Since August 2003, Japan has a Mutual Law Enforcment Assistance Treaty (MLAT) with the United States. Remember, it was through MLAT, that the DEA forced Hushmail to cooperate on rolling-over on its users.
Furthermore, Anonymousspeech generates and stores PGP crypto keys for you, in much the same manner as Hushmail. Therefore, if hit with a request under MLAT, they would arrange to grab your passphrase and decrypt your email just as Hushmail did.
Link to details about U.S-Japan MLAT Treaty signing:
Signing of a Mutual Legal Assistance Treaty between
Japan and the United States of America
6 August 2003
The signing of the Treaty between Japan and the United States of America on Mutual Legal Assistance in Criminal Matters (Mutual Legal Assistance Treaty) [PDF] took place on Tuesday, 5 August 2003, in Washington D.C. The treaty was signed by Ms. Mayumi Moriyama, Minister of Justice, Mr. Sadakazu Tanigaki, Minister of State, Chairman of the National Public Safety Commission and Mr. Ryozo Kato, Ambassador of Japan to the United States of America (Japanese side) and Mr. John Ashcroft, Attorney General of the United States of America (US side).
I can't post the link, Google U.S. Japan MLAT for the Japanese Ministry of Foreign Affairs Website page where the above text can be found.