Tricks to manage multiple accounts in Gmail

Various ways.

Check if your e-mail account has been hacked

Baiting the guy with an enticingly labelled e-mail attachment that will alert you when it's been opened.

Did they open that link you e-mailed to them?

It generates a URL from the one you want to send. This new one is what the recipient clicks on. You get an e-mail if that happens indicating city and state.

Disposable web accounts

Like email, phone numbers, etc.

Encrypted Hushmail not so hush

... court document from a federal prosecution of alleged steroid dealers reveals the Canadian company turned over 12 CDs worth of e-mails from three Hushmail accounts, following a court order obtained through a mutual assistance treaty between the U.S. and Canada. The charging document alleges that many Chinese wholesale steroid chemical providers, underground laboratories and steroid retailers do business over Hushmail.

How to track the original location of an email via its IP address

Down to ISP and city, anyways.

GuerrillaMail -- 15 minutes of email

The account exists only for 15 minutes.

Self-destructing, recallable, erasable, non-forwardable, non-printable, non-savable email

These are included with the free level.

10 minute mail -- disposable e-mail address

Maybe you want to sign up for a site which requires that you provide an e-mail address to send a validation e-mail to. And maybe you don't want to give up your real e-mail address and end up on a bunch of spam lists.

Orgoo -- webmail and all IM replacement

The key difference between Orgoo and the major Internet webmail services is that it also integrates instant messaging from all major providers.