Rearranging the letters of 'erised' (Mirror) gives:
Desire.
(by J,k, Rowling by hand) (pending approval)
Other related anagrams without their own page:
"Harry Potter, Ronald Weasley, and Hermione Granger" -> "A master hero, worrying partner , gal - learned hoyden." (by Aronas Pinchas using Anagram Genius) (2007) (pending approval)
"Daily Prophet's special reporter Rita Skeeter" -> "A tartlet pest's epic lies irk poor Harry deeper." (by David Rutter using Anagram Genius) (2006) (pending approval)
"Daily Prophet's special reporter Rita Skeeter" -> "Pirate literate pest speckles poor dire Harry." (by David Rutter using Anagram Genius) (2006) (pending approval)
"Daily Prophet's special reporter Rita Skeeter" -> "Shitty liar despairs creep perpetrate looker." (by Chris by hand) (2006) (pending approval)
"The Daily Prophet's special reporter Rita Skeeter" -> "Potter's poke pals cede her pet lies irritate Harry." (by David Rutter using Anagram Genius) (2006) (pending approval)
"Michael Gambon is the new Dumbledore" -> "Shithead die now; menace glummer blob." (by Chris by hand) (2006) (pending approval)
"Michael Gambon is the new Dumbledore" -> "Wholesome bum in bleed. Damn tragic, eh?" (by Chris by hand) (2006) (pending approval)
"A Personal Computer" -> "Rent our MacOS Apple!" (by Toby Gottfried by hand) (2004)
"A Personal Computer" -> "Normal CPU operates." (by Hans-Peter Reich using Anagram Genius) (2003)