Someone challenged me today into asking: what is OSGI ?
That reminded me that I didn't read enough to better answer this question. For that reason, here's a list of links I make as well to myself and to others curious enough to learn further:
http://www.osgi.org/
http://eclipse.org/osgi/
http://www-01.ibm.com/software/webservers/appserv/was/features/
and the search for osgi keyword through the ibm's site, which recently got an redesing, which I kinda like:
http://www.ibm.com/search/csass/search?sn=mh&q=osgi&lang=en&cc=us&en=utf
happy reading !