This is hilarious. If the Chinese government wanted some information out of gmail, apparently they have to hack it. If the US government wanted some information out of gmail, all they have to do is ask.
Or are you not aware of the massive keyword filters that the US government has on any electronic communication inside, and possibly outside, the US?
Do you know what's funnier than any Chinese activist being labeled as a Tibetan separatist? Any disgruntled airport customer who sends a twitter can be labeled, and arrested, as a terrorist.
Even in the US, requesting confidential email information requires a court order. If any government can intrude in web based email system, then simply nothing can be trusted---Yahoo, Hotmail, GMail, your local ISP provider. This is the same level as a bank account. Privacy issues is extremely vital to keep a free society, which at least the US and other countries aspire to. Please note the ability to access confidential mail accounts literally can be used by any administration on power to smear opposition party, politicians and media as well. That would be the equivalent of illegal wire tapping.
Keyword filters are done along the backend core IP routers. You really should not be asking Google for this, you should be asking for CISCO. BTW, these are among the 20 companies that were hacked along with Google; another company surprisingly on the list---Northrop Grumman.
Please note another tapping issue. Iranian government were able to track dissenters with alleged Nokia-Siemens complicity. Hence the so called "Nokia boycott" among the Iranian dissident community. Tapping is done on the telco side, not on the servers.
Right now in China, a dirty word on your text (sexting) can get your phone account banned, maybe get you in jail. That's right. They're filtering even the text messages now. Does that mean you will get in trouble with flirtatious text messages to your wife or girlfriend?
And lately even the Chinese censors seem uncomfortable with Avatar showing now in China, apparently because of the "urban renewal" theme.