It's not going down, we've just started pointing new users at ShareLaTeX, since that's where our development efforts are focused. If you have an account with ScribTeX you'll still be able to use if for the foreseeable future.
Ah, thanks. If that's where the development going, would you recommend moving existing projects there? I could do it by hand, but is there a way to use Git or some other automated process to transfer projects?
We don't have an automated way yet but there will be one eventually, most users are doing it add hock as you can import zip files easily. It is up to you which tool you want to use, sharelatex still lacks the git push and pull which may be a deal breaker for you but it is the future.