I swear I read this article (or a similar one that they ripped off) about a month ago...
Ah yes, was an article about data being more expensive to text than to send to the hubble: http://www.physorg.com/news129793047.html
In any case, a google for sms megabyte turns up a ton of hits for this, most of them at least 6 months old.
Good job TechCrunch!
(is that sarcasm I smell?)