The Roy Rosenzweig Center for History and New Media at George Mason University has released Omeka 2.0.
Here's an excerpt from the announcement:
The most important improvement is a completely revamped admin interface, which includes many features to improve workflow and make it easier to build your sites. The search functionality is also dramatically improved, and covers much more of the content in the sites. . . .
Omeka users will notice improvements right away with an upgrade to 2.0 or the launch a new installation. For example, site administrators have much better tools to build custom site navigation without having to hack around in the code (Check for "Navigation" under the Appearance settings.) Also, you'll notice major improvements in file handling. Now you can reorder item files, and the system produces derivatives (thumbnails, etc.) from a much wider array of file types, not just image files.