My friend just told me that the Chinese version of Google Talk is NOT encrypted, while the English version is encrypted. As shown below, when using the Chinese version, the message (in the red circle) is not encrypted at all! One thing you should know is that the Chinese version is higher than the English version, which suggests Google might remove the encryption on purpose. It reminds me of the shit of TOM-Skype, which watches the text conversation of users.
Here goes the screen shot of the Chinese version (126.96.36.199), and you can see the text transmitted unencrypted at all:
Here goes the screen shot of the English version (188.8.131.52), which is obviously encrypted using TLS 1.0 as the first 3 bytes are 0×17 0×03 0×01: