UPDATE 22 feb 17.00 CET: All of Arduino web services are back up and running again. Thanks for your patience while we upgraded our system!
As you may have noticed we’ve been witnessing several problems with our website since last Sunday 3 a.m. CET. In the next hours we’re starting working on some major maintenance to the Arduino website: tomorrow Thursday 21st of February, around 3 p.m. CET until Friday 22nd of February 2013 same time.
We’ll then be on hand to resolve any issues that arise after we re-enable the site, but please be aware that further outages may occur as we fine-tune server features. After the site is back, please let us know if you encounter any problems using it.
For more detail: Upcoming Arduino Site Maintenance