According to the Celestial Emporium of Benevolent Knowledge, it's straightforward to put each Dominion card into one of 14 categories:
Those that are in Seaside
Those that are frequently trashed
Those that do what you expect
Remodels costing $3 or less
Villages (or Throne Rooms)
Outtakes
Promos
Those that are included in this classification
Those that make you tremble
Those that have more than 10 copies
Those illustrated by Alayna Lemmer
Et cetera
Those that you just lost a game by counting on
Those that are used in memes