You know, my now-XW sent an email to my boys' teachers to let them know what was going on - just because there was kind of a need to know there, so they were aware.
Most people close to me knew what was going on as it happened, but at this point I don't really feel a need to say it. I live my life, do my things, and will occasionally say things like "Sorry can't make it, I've got my boys tonight" and I leave it at that. I guess if I'd have advice, I say if you need to mention it then mention it in passing.
The ring? It's in my closet. I don't know, it's still important to me, in the sense that it represents 10 years - well let's say 11 if you count the end - of my life. It represents the period that gave me my boys, and a relationship that was significant to me. I guess I don't feel a need to do ANYTHING with it. I know XW is keeping hers, thinking that she'll give it to one of the boys to give to his wife some day.