Looks like Anonymizer's changed their logging policy.
From their FAQ:
Does the Anonymizer keep logs on who I am and the sites I visit? How long do you keep logs? Will you release the information? The Anonymizer logs only a hash of your IP number (machine address). We cannot determine your IP number from these logs, however, this enables us to have logs to study in order to increase performance, and as a deterent to prevent abusive use of the Anonymizer for purposes such as e-mail spamming, harassment, and so on. If we didn't, many people would use it for these purposes, and the usability of the service would deteriorate as a result. Anonymizer tools are not a shroud for those who wish to engage in illegal and unscrupulous activities. However, due to high usage, it is impossible for us to keep logs for very long, and we cannot maintain archives. See our user agreement for more details.