Blackberry's communications are encrypted with a non-disclosed algorithm. As a result, the US Secret Service consider them as insecure and prevent government officials from using a Blackberry for confidential business. At the same time, some less than democratic governments gripe against the impossibility of eavesdropping and forbid Blackberry because they're "too secure" for their tastes.
As of today, Saudi Arabia blocks Blackberry communications: http://mobile.venturebeat.com/2010/08/04/saudi-arabia-blackberry-block-begins-this-friday-u-s-authorities-admit-to-data-taps/
Isn't technology great? 
"If those who say bad things about me knew what I think of them, they'd say even worse." (Sacha Guitry)
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"Earth is the cradle of mankind. Nobody can live in the cradle forever" (Constantin Tsiolkovski)
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"Earth is the cradle of mankind. Nobody can live in the cradle forever" (Constantin Tsiolkovski)
