Owl Mail
Periodicals
    The Daily Prophet – 5 Knuts an issue, delivered by Owl Post
    Transfiguration Today - III-49
    Witch Weekly
    Which Broomstick – A magazine devoted to the Broom, includes advertising.
    Comic Books - The Adventures of Martin Miggs, the Mad Muggle (II-40)
Wizard Wireless Network - WWN
Telefire (?)  Seen twice in Book IV where the face of the user appears in the fire.  The face is capable of eating!