It appears that Google is having trouble with some of their services, including Gmail. Gmail did experience a complete outage, though Google says that service has been restored to several users, and now it, Google Documents, and Google Presentations users are seeing service disruptions. Google expects full service to be restored within the hour.
UPDATE: Looks like neither Skynet's first strike nor a Cylon invasion were to blame, but a power failure in Michigan. AT&T has put out a press release (via Chicago Breaking News -- Thanks Jeremy!). Here's hoping everyone gets their ubiquitous connectivity back ASAP.
Both Jeremy (Chicago) and Dieter (MN) seem to be having no-joy with their AT&T service today. (I'm on Rogers, so aside from poverty, I'm fine thanks!)