Another useful idea

Nowadays i am stunned and surprised with so much creative implementations in web.

For example the site http://www.dodgeit.com/
Whenever you need to give an email to a site you can just give anything@dodgeit.com. Then you can go to the site and login with the email-id [anything] and check the mail. Do this for places where you need to give email-id to download something or access something. Do not give this type of id where you expect an important mail or that has password for a registration.

Another creative thing is http://myemail.com. Here you just give your username password for any POP3/IMAP server you need and it can login to that account. Very simple idea but nonetheless extremely creative as well.