Is there any free anonymous browsing service that is fully loaded?

Here’s my problem:

I am in India, and for some strange reason, the Indian govt. has asked all ISPs to block YahooGroups. I can access YahooGroups through anonymous browsing services like the-cloak or anonymizer, but am not able to post messages and/or sign in (depending on which anonymous service I use).

So, is there a free anonymous browsing service that is fully loaded?