Digital cash and anonymous remailing aren't the only ideas in terms of sustaining anonymity for internet users. There are other ideas on how to prevent the user's private information from becoming public knowledge:
There are many companies that produce products to hide personal information while browsing or sending email. Zero-Knowledge Systems is one example of such a company. Their product, Freedom, uses pseudonyms that cannot be linked to real identities in order to disguise personal information. ZDNet Reviews Freedom.
Other companies are trusted third-party sites, such as Anonymizer.com. Clients of Anonymizer.com and other trusted sites use the site as an intermediate between them and websites. This creates a barrier between the client and the web site, which prevents the gathering of information by malicious web site owners.
Windows keeps many records of sites visited, in histories and caches, and with a bit of careful maneuvering, these records are accessible from the outside. In addition, some sites store information on internet users' computers in the form of cookies, and these cookies could be used to track a particular user. There are some products, such as NSClean, that will clean out these records to prevent companies like DoubleClick from keeping track of users.