The Halo-Extension to Semantic MediaWiki is now called "SMW+". We just released version 1.0 of SMW+, which is _not_ identical with version 1.0 of the Halo Extension.
The following features are available with version 1.0 of SMW+:
* LDAP installation support
* Access Control Lists (ACL)
* Whitespaces in path name (Windows)
* Several minor bugfixes
* Compatible with SMW 1.0.1
* Compatible with MW 1.12 stable