If you have been a power user of Apple products you know that Apple has a KB article or KnowledgeBase for all its products and features,etc on a site http://support.apple.com/kb/. Recently there has been a new addition to the KnowledgeBase, its Jailbreaking. No if you are thinking that you will find article on how to Jailbreak you are wrong. The KB article says what negative issue you will have if you Jailbreak your iPhone, iPad or iPod Touch.
You can read it here.