E-mailed a buddy of mine in Iraq and as of now, this hasn't had any impact on computer usage or personal e-mails. We'll have to wait and see.

In Germany, there were a ton of websites restricted during the duty day, everything from sports, to personal e-mail to the usual blocked sites. You could access these semi-blocked sites after the duty day or during lunch, but not during duty hours. Of course in Iraq/Afghanistan, its always a duty day so I'm not sure how that approach would work there.