This is a new concept where advertisers are paying companies to send emails to the public to read.......and the public are getting paid to read these emails!!!. One tip I can give is too sign up to a few of these companies, read some Email (topics selected by you) and wait for the cheque in the mail.
Here are some sites where you can sign up to get paid to read emails.
http://www.inboxdollars.com/signup.php?ref=0029259
http://www.MintMail.com/?m=21563
http://go.readclick.com/refid.cgi?refid=88575
http://www.sendmoreinfo.com/id/1405596
http://pay4mail.com/members/VIv/
Sign up one at a time or all together, remember its the small things in life that make a difference