According to TVGuide.com, these are the unaired episodes:
SpongeHenge / To Save a Squirrel
The Inmates of Summer / 20,000 Patties Under the Sea
Stanley S. SquarePants / Battle of Bikini Bottom
Banned in Bikini Bottom / The Two Faces of Squidward
Only one of those pairs (so far) has a description of what's going on in the episodes.
Banned In Bikini Bottom
Krabby Patties are banned from Bikini Bottom after SpongeBob's musical tribute irritates Miss Priss.
The Two Faces of Squidward
Everyone falls for Squidward after plastic surgery makes him irresistibly handsome.