So, it seems like Sun is starting to go the whole hog wrt OpenSource. The latest is that we hear Sun Plans To Make Java Enterprise System Open-Source.
Although their product hasn’t made a large push in the industry, the JES is certainly a full stack, including real world functionality like LDAP (as Rickard mentions).
I think it is cool that Sun is putting this all out there (and they need too), but I do wonder where they will make any money. I don’t think the future is SPARC.