A quick update - the Info-Mac archive site at <sumex-aim.stanford.edu> is back up and running, although you should still try to use mirror sites whenever possible.
Thoughtful, detailed coverage of the Mac, iPhone, and iPad, plus the best-selling Take Control ebooks.
Highlight Groups in Address Book
Want to see which groups one or more contacts belong to? Select them and then press the Option key. Address Book highlights the groups of which the selected contacts are members.