TweetLater.com will be unavailable on Saturday May 30, 2009 between 8:00 AM EST and 11:00 AM EST.
During that time no automation will take place, and scheduled tweets and DMs will not be published.
When the site is available again, scheduled tweets and DMs that should have been published during the maintenance window will be published as soon as possible. Follower processing will then also resume where it stopped at the start of the window.
If you have any time-critical tweets or DMs, please modify their scheduled times now so that the times fall outside the maintenance window.
This blog and the support ticket system will remain online during the maintenance window.
Update:
The maintenance has been completed.
If you are still seeing the “down for maintenance page” with the message about propagation of the new IP address, you may want to consider switching over to use the DNS servers at OpenDNS.com on your computer.
SocialOomph Blog 
Thanks for letting us all know, much appreciated!
Thanks for letting us know!
What is the IP address of the new server? I can't get to it from the URL.
The IP address won't help you. It is best to wait until the change has propagated to your DNS server.