MaskMe is a good complement to Anonymizer
MaskMe (introduced in this blog post) is an interesting new entrant in the privacy services space.
They provide the ability to provide "masked" Email addresses (like our old Nyms product), phone numbers, and credit cards.
Combined with Anonymizer Universal, you will be able to do a fairly comprehensive job of shielding your true identity from websites and services you use.
This is a brand new service, so it is hard to know how it will fair, but it is certainly worth watching.