I hope I'm not missing an easy way to do this, but... Now that I have decided to start using tags, it would be SO nice to be able to select multiples GROUPS, and add them all to a certain tag. Instead, I have to go inside each group, select all contacts, then add them. Then go on to the next group and do it again.
Second, I don't seem to be able to search for (and tag) all people who were added by a particular source. I can sort by source, but then I would have to click every single contact individually, because if I do the "select all" box, it selects ALL contacts and doesn't know that I wanted it narrowed down to just the source.