Im with the others who don't really use notifications, but the ability to email people is really something that I would like to have turned back on. Especially to get a hold of errant players who disappear from my games for more than a week at a time.
I like the notifications - like others I would rather know when there is a new, relvant post rather than having to check and find (hey, via a work computer the outgoing connections are logged at the firewall, I would prefer to have fewer items on the logs!).
Also, I think the ability to email others is very useful.