The BlackBerry PlayBook isn't a very good tablet, but RIM is enticing buyers with promotions like the recently-announced buy two get one free deal, which is still going. Now, the company is scraping the barrel of ideas and offering to give you a free tablet if you upgrade to BlackBerry Enterprise Server v5.0 by December 31st, the same day the other promotion ends. What? You're not a system admin looking to sink thousands of dollars into an upgrade? Well, if you know someone who is, maybe you can find out how a company could make productive use of a solitary PlayBook. We're stumped.