The current EMBOSS release distribution can be downloaded from the mirror on the EMBL-EBI FTP site.
Automatically generated documentation for the EMBOSS release can be found on the EMBOSS SourceForge site. While this is not a comprehensive as the manuals available on the EMBOSS Open-Bio site, it is much better than nothing :-).
As I understand it from the EMBOSS folks, they are aware of the issues with the Open-Bio site are are working with the Open-Bio admins (see http://www.open-bio.org/ ) to get the issues addressed. At the moment, while the EMBOSS FTP and web sites are unavailable, the EMBOSS mailing lists appear to be back up (see http://mailman.open-bio.org/mailman/listinfo/emboss ). See the EMBOSS mailing list archives for updates on the status of the web and FTP sites, as well as other discussion relating to the programs in EMBOSS and their use.
The emboss formula has been updated to avoid running embossupdate from make install, so it should be installable while http://emboss.open-bio.org/updates is down.