The outage you may have seen on Wikipedia earlier this morning was not another SOPA-style blackout, nor was it any sort of foul play by upset teachers. The cause was a simple networking glitch with servers in Tampa. As of now, the site should be back up to its fully functioning and fully informative state.
The outage started around 6:30 a.m. PT with a simple error message that the "servers are currently experiencing a technical problem." The site was somewhat navigable, with pages only partly loading and much of the content style and layout being stripped out. Just about an hour later, the site was back to normal.
The Wikipedia status page was aglow with orange and red which notated warnings and service disruptions. As of now, almost every single one is back to green or orange, showing that the site has recovered. The outage is said to be "due to networking issues with servers in Tampa, Florida," but no further information is available.
"We certainly haven't been hit by a denial of service attack." Further contributing to the story of networking issues rather than a bunch of angry teachers teaming up.