With the preponderance of mailing lists, newsletters, and e-zines on the Web, it's difficult to find the information you need. And once you do, how do you sign up and keep your in-box from overflowing with unwanted solicitations? Enter Mailshell, a free online solution to limit spam, cut down on mailing-list clutter, and maintain your anonymity on the Web.

Pros and Cons Pros • Easy to subscribe and unsubscribe • Many options to customize Cons • Options initially overwhelming • Too many selections can bog down the interface

As a registered user (an e-mail address is all the firm asks for), you can take advantage of Mailshell's protections against spam and privacy invasions. You can even choose to play it close to the vest with a totally anonymous user profile and provide only the personal information you think is prudent. All e-mail messages are filtered through Mailshell's Web site, and you have the choice of leaving them on your 50MB of server space or forwarding them to your own e-mail account.

With its Yahoo-esque layout and 117,729 mailing lists, Mailshell's offerings may seem a tad overwhelming. But the site provides a detailed description of each mailing list to help you decide. You can view the listings by date, popularity, users' picks, or Mailshell's editors' picks. Each listing has its own information, with an at-a-glance breakdown, a blurb from the mailing-list author, and even a sample e-mail message. Many lists even include reviews from Mailshell editors. When you're ready, you can subscribe to (or unsubscribe from) whole groups of lists at a time, because much of the process is automated.

This wealth of information and high degree of customization comes at a price, however: The interface can get bogged down if you manage a large number of lists and the attendant messages. Still, the ease of subscribing, spam filtering, and privacy protections make a visit to Mailshell a necessity. Your in-box will thank you.