In the interests of preserving the useful comments on this post (which was originally about a scheduled downtime required to replace defective hardware and to deploy a faster database machine), I'm leaving this post up forever.
The hardware upgrade appears to have been a great success. Server load is quite low and so far there are no reports of serious problems.
The post originally said :
Nuevasync service will be unavailable for a time today while a major hardware upgrade is done. The planned outage time begins at 11am MDT (18:00 UTC) and is expected to last two hours. During this time the web site will redirect to a maintenance page and no syncing will be done. iPhone/iPod users : PLEASE DO NOT DO ANYTHING. Don't 'resync'. Just leave your phones alone and they will pick up sync again when the service is restarted. If you resync, all your data will be deleted from the iPhone and it may take a long time for it to be synced back.
Update : the upgrade went well, and it turned out we had a bad hard drive (bad in a bad way in that it didn't report any errors but silently hung the system when certain sectors were read). Dealing with the drive issue (which means re-installing the OS on the machine since the old drive couldn't be imaged) will take a little longer than the expected down time. We should be up in about 45 mins time (2:30 MDT, 21:30 UTC).
In response to the people who commented that the old service status posts should not be deleted : well I agree in so far as I'd like the comments preserved, but on balance it seemed messy to leave all those rather quickly written and often in hindsight incorrect posts on the blog. What we really need is a page that a) stays up when our connection or servers are down and b) isn't a blog. Right now we don't have that in place so the blog got abused with the status posts. It's not ideal but we've taken the approach that you the users would rather we fix the problems than make things all pretty and neat.