PSILoveYou.ps, by Tim Poston, won an honorable mention.

Tim Poston writes:

Un-Documentation:
 The call for entries says "The people who read your program shouldn't
 be able to figure out how it does what it does."
 That depends who they are.
 They probably can, if they know a little linear algebra
 from a geometrical point of view.
 A lot of programming freaks don't.
 
 So this won't be "most obscure".
 But it's at least passable art,
 very compact, PostScript 1,
 and useful in humanity's main activity
 (field tested, I promise).

The heart is one shape being redrawn after a transformation, which
is probably something like .9 .9 scale 10 0 translate. How does the
author do this?