Fairly minor. We have the nice e-mail alert plug-in. However, if you click on the link in the e-mail, you go to an un-logged-in view of the group (and therefore can’t do anything. From which, I think, you have to go to the home page, log in and then retrace your steps back to the group to see the messge.
I suppose the suggestion is to have a log-in box available more readily (maybe a pop-up) so that you get straight back to the alerted posting once you have logged in.