According to Jane McGonigal playing games makes you more productive. She does have a different take on what being productive really means, though. But I think she's on the right track.
This is a great fit for IT staff--how many geeks don't like a good game now and then. Encouraging game play to focus the mind and build confidence has the potential to improve performance, not to mention make your staff happier. Those pool, foosbal, and air hockey tables in offices maybe have more usefulness than just a place to blow off steam and retain workers.
Jane says this in the Washington Post Express, "Playing a game before taking a test or making a presentation, even just for five minutes, can really make you more confident."
I plan to consider ways to encourage game play at strategic times during the day and try to find ways to measure the results.