I just got an email offering me free instant messages on my cellphone from SMS.ac - after some research, I'm finding some pretty nasty reports on them, including claims of criminal activity and fraud.

Here are links to some of the stuff I found on them. You can find more by going to google.com and searching on sms.ac - there is a lot of stuff about them.

If you have signed up with them, and you entered any of your passwords, you might want to change them immediately. These guys have a habit of using your accounts to get more email addresses to send their offers to. I think someone on one of these links mentioned that they entered their hotmail password as part of the sign up process. If you did too, change your hotmail password, quick!

http://www.unleadedonline.net/uo-243-1.html

http://www.ripoffreport.com/reports/ripoff102047.htm