An anagram, as you all know is a work or phrase made by rearranging the letters of another word or phrase.  The following are exceptionally clever.  Someone out here either has way too much time to waste or is deadly at Scrabble.

Dormitory                      Dirty room
Desperation                   A rope ends it
The Morse Code           Here come the Dots
Slot Machines                Cash lost in 'em
Mother-in-law                Woman Hitler
Snooze Alarms               Alas! no more z's
Alec Guinness                 Genuine Class
Semolina                         Is no meal!
The Public Art Galleries   Large Picture Hall, I Bet
A Decimal Point              I'm a dot in place
Eleven plus two               Twelve plus one
Astronomer                     Moon Starer
Princess Diana                 End in a car spin

And here is the most intriguing part:

Year Two Thousand           A year to shut down