Ellen McLain reads a letter in GLaDOS's voice to Princess Celestia. Some vocal effects were added in later.
A fan made music video of Jonathan Coulton's "Still Alive" set to clips from old public domain horror movies.
(The Brain that Wouldn't Die, Portal)
Sure Valentine's Day can be Cheezy, but that's just how we like it!
The guy who did "This is Aperture" has come out with another "Portal" themed song parody.