FYI — From another list:
Please copy this to local lists as appropriate.
Thursday 7:30am (23rd June 2011 GMT/UTC+0) the API and map editing on
www.openstreetmap.org will be unavailable. The maintenance period is
expected to last for 12 hours.
The following services will be unavailable during the maintenance period:
API, editing features of www.openstreetmap.org and
planet.openstreetmap.org including replication diffs.
The wiki, mailing lists and help.openstreetmap.org will be unaffected.
Technical: Some of the core servers are being re-located to another data-centre.
Additional information will be posted to the following link closer to the time:
http://wiki.openstreetmap.org/wiki/Servers/June_2011_Maintenance
/ Grant
Part of the OSM sysadmin team.