Following him for 6 months is easy enough, you just don't cancel it..... I never really use my twitter page so I wouldn't even notice who I was following. :P
Is it possible to follow people, cancel the following, and then follow them again? You know... in case you're before the millionth one.
I think the idea is pretty funny, but if I was EA I would have used something more useful as a promotion. Instead of Following Ashton Kutcher (Who is this guy, again?) I would have done something to benefit my company in at least some fashion.