Ok I'm going to sound like a total noob but I know that dev unlocked phones are capable of taking screenshots of the screen (though I thought this was due to a homebrew app) but wasn't mango supposed to allow that? And if so how is this done?
Yes, homebrew. Requires manipulating a registry entry which is not allowed in Mango for homebrew apps. And I don't believe an API has been made available for developers. Microsoft might surprise us this Fall but I wouldn't hold my breath. Do miss it though.