These are the top selling trilogies on AbeBooks.co.uk, BUT they have their own rules as to what qualifies as a trilogy. For example, they've left out The Lord of the Rings as Tolkien intended to publish them in one volume.
Most of my favourite trilogies (what I can recall anyway) seem to be of the fantasy genre:
The Juniper Trilogy by Monica Furlong
His Dark Materials Trilogy by Philip Pullman
The Old Kingdom Trilogy by Garth Nix
The Tales of the Otari Trilogy by Lian Hearne
The Assassin Trilogy by Robin Hobb
The Cazalet Family Trilogy by Elizabeth Jane Howard
The Cathedral Trilogy by Elizabeth Goudge
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