The way I discovered SF was down was when I was trying to install some Slackbuilds and kept getting MD5 mismatches on the source downloads. I noticed I was getting the same MD5 for several different packages, so I tried to manually grab a package and that's when I hit SF's error page (which sbopkg was happily downloading and trying to pass off as somesourcepkg.tar.gz).
I found myself in the odd position of hoping SF would come back up so I could finish what I was doing, when I'd normally welcome the news that they had shut down.
Sadly I too found it was screwed a few days ago when trying to pull some source code hosted there (ironically so I would have my own copy in case things went wrong there...). I just got their 'Disaster Recovery Mode' notice and a subset of binary packages available.
Lots of google searching for what's wrong with Sourceforge revealed nothing (other than complaints about their packaged installers/crapware). Now I have the answer to the question I was really asking.
I just need to wait and see if the developers of the packages I need will somehow migrate to github so I can get the source...
I found myself in the odd position of hoping SF would come back up so I could finish what I was doing, when I'd normally welcome the news that they had shut down.