As has been widely reported already, Egypt has shut down Internet access since yesterday afternoon. Of course, this doesn't mean that information is not leaking out through Al Jazeera and other outlets.
While I'll steer clear of any political commentary, the political uprising found its legs on Twitter and Facebook, and it appears that shutting down those channels is the desired effect of the Internet lock down.
Our monitoring station in Cairo last reported in to us around 2:15 p.m. EST yesterday, and it still has not reported back. We'll be back with another update when it does.
Customers monitoring from Cairo can configure your accounts to use an alternate monitoring location or just sit tight until they come back online.
UPDATE : I was more than half expecting to see Cairo back online over the weekend, but as of 9:30 a.m. EST on Monday morning, we are still offline in the Cairo data center.
UPDATE : AlertSite's Cairo, Egypt monitoring location is back online after the government ordered Internet service be restored. We were back up at 4:55 a.m. EST today.