LONDON—"Brace yourself for five piping-hot minutes of inertia," said William Barrett. Then he began reciting the names of every single one of 415 colors listed in a paint catalog: damson dream, dauphin, dayroom yellow, dead salmon…and on and on and on.

Mr. Barrett's talk was titled, "Like Listening to Paint Dry," and to judge from the droopy faces in the audience, it was a hit. He was speaking, after all, at a conference of boredom enthusiasts called Boring 2010, held here Dec. 11.

For...