The hypergrid extension is now available for opensim tagged release 0.6.0. Grab it from:
http://forge.opensimulator.org/svn/hypergrid/tags/0.6.0

This version of the hypergrid has the following features:

* Support for hyperlinking any opensim to any other opensim on the internet, given its external host name + port, and assuming both ends run this extension.
* Support for agent teleports across hyperlinks.
* Support for agent home teleports (Ctrl-Shift-H).
* Remote access to user's inventory listing.
* Preliminary support for remote access to user's inventory assets. In this version, only rezzing objects from inventory is minimally supported (no textures); other scene-inventory functions coming soon.