How could I allow content editors to send email to a selected bunch of users? I have a content editor that wants to be able to send emails on a regular basis to a selected bunch of users. Could I create a view of all site users and use Views Bulk Operations for this?
If your content editors need to be able to select the group they are contacting  you can use Views Send. You can also use Rules (and probably Views Rules to ease the process of writing the rule some) particullarly if the editors are not going to be editing the message (if they are sending a notice about content updates or something similar).