[Update: And we are back]
We are rolling out a major upgrade tonight. This will address a number of bugs, include slight updates to unit balancing and improved support for Internet Explorer 6 and 7 and Safari.
Also included will be a number of new units. These will become available once we have added new and improved maps to support them (via harbors and airfields) later on.
For those of you who are still waiting to play (and there is a great many!): Once we are back up we will send out more invites, too!