A phone Mart employee warned me about this today.
Anyone else hear of this (can't use that language in here!!!! AAAaaaaaaaaaaaargh!)

ALERT - Special Dialers & "Modem Hijacking"

If you are visiting a web site that requires you to download a file or special
viewer to access the Web site's content, please exercise caution. While
occasionally this may be a legitimate request, it can result in something
known as "modem hijacking".

This can occur when you visit certain Web sites. A pop-up window
appears prompting you to download a file (often stating that a special
viewer or special dialer is required to view the page). The pop-up box
contains detailed 'Terms & Conditions'. Once you accept these Terms &
Conditions (by pressing 'ok', 'I accept' or potentially an "X"), a file will be
downloaded onto your computer. The file can then use your dial-up
modem to connect to phone numbers in foreign countries such as Sao
Tome or Nauru. This can lead to unexpected long distance charges.

Please note - The customer is responsible for charges associated with
these calls.

Read all disclaimers and Terms & Conditions carefully. Ensure
that you fully understand the terms before continuing.
Do not download any files unless you are certain of its legitimacy.