Mailing lists are funneled into news groups. Gmane does spam detection, cross-post handling, has a TMDA-fueled encryption/forwarding service, a web interface, respects X-No-Archive, supplies RSS feeds, uses SPF, features user-defined filters, more...
a tool that simplifies the process of compressing and sending your files online. It isn't a replacement for the traditional desktop compression tools, but its just a tool that makes things easier by cutting down all the 'krunching' hassles.
Disposable temporary e-mail address which expire after 15 minutes. You can read and reply to e-mails that are sent to the temporary e-mail address within the given time frame.
You can : aggregate several rss to one, make an rss out of emails, make pdfs out of rss, send rss to mail, turn your pop account into an rss feed, make a podcast of rss with voice reading and so on.
page will generate a HTML encoded mailto link that is reasonably 'spambot' proof. Spambots crawl over websites looking for email addresses, when they find one they add it to their database for junk email.
Using email for almost everything from FTP downloads/uploads or Free WEB site hosting to using it for gatter FINGER or WHOIS information (telnet is still not available :)