Part of our long-term plan to improve SourceForge was to migrate to a new datacenter with all new hardware. That migration was scheduled for and has been taking place this week.
Most services are now restored including SourceForge.net, downloads, web uploads, mailing lists, project web hosting, sftp uploads. Our team is working as hard as they can, and we will update this post, as well as the SF Net Ops handle on Twitter when these services are restored.
Thank you for your patience.