Not anymore...

from their website
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PersonalWhistle Monitoring (FREE!)
Netwhistle's PersonalWhistle/Free Monitoring Options are ending on May 1st, 2001. We are now offering a free 15-day trial of our monitoring services to new customers. After the 15-day trial, you will be invoiced for the selected monitoring services.
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Check out this thread: http://www.webhostingtalk.com/showthread.php?s=&threadid=9980

they are no more free.. but they yet seem to be sending my updates :)

hmmmmm.......guess what? a few minutes after i made the post above.. i got an email saying i have to pay :(

my luck sucks :(