Hi everyone, hope I'm not butting in, but I just remembered the Wikipedia article on Omega. It touches on some of the topics mentioned. The links in the article are very interesting - the article is where I first heard about the possibility that some globulars are highly likely to be the core remnants of small galaxies swallowed by the milky way. Fascinating stuff.
http://en.wikipedia.org/wiki/Omega_Centauri