Peter Murray-Rust describes some of the many meanings of "open" in preparation for starting a Wikipedia article on open data.
I like this (perhaps inadvertent) echo of Stallman's free beer:
“Open Foo” does not imply “Open Bar”.
Posted by
Peter Suber at 9/27/2006 11:01:00 AM.
The open access movement:
Putting peer-reviewed scientific and scholarly literature
on the internet. Making it available free of charge and
free of most copyright and licensing restrictions.
Removing the barriers to serious research.
I recommend the OA tracking project (OATP) as the best way to stay on top of new OA developments. You can read the OATP feed on a blog-like web page or subscribe to it by RSS, email, or Twitter. You can also help build the feed by tagging new developments you encounter.