Owl Mail
    Howlers
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)
    The Quibbler - V
Wizard Wireless Network - WWN
    Witching Hour, with the popular singing sorceress, Celestina Warbeck
Telefire (?)  Seen twice in Book IV where the face of the user appears in the fire.  The face is capable of eating!