'Glee:' Carol Burnett as dear ol' mom

 As Gleeks know, the great...the wonderful...the incomparable...the splendiferous...Carol Burnett is on "Glee" tonight.

  Tonight!

  That's like, I dunno, hours away.

   She plays Sue Sylvester's mom. And my heartfelt thanks to the always-excellent LA Times "Showtracker" for reminding me. t

   Check it out...