On June 6, 2010 the datacenter will be adding additional capacity to some routers.
We anticipate 20 mins or downtime or less between 5am and 10am UTC on the following servers:

dweb23, dweb26, dweb27, dweb46, dweb47, dweb80
krait
mail2
web5-web7, web28-web31, web33-web35, web37, web40-web42, web48, web50, web53

We also anticipate a short downtime on our control panel.