@spendius,
Alain de Boton is one of Britain's biggest Proust fan; he even wrote a "how to" book based on Proustian psychology... (i.e. what does Proust tell us about love, friendship, etc). Decent stuff.
His list of atheist virtues seems ok to me. IMO, it's not so difficult to see where they come from: not Christianity, but the old Roman virtues.
Auctoritas
"Spiritual Authority" The sense of one's social standing, built up through experience, Pietas, and Industria.
Comitas
"Humour" Ease of manner, courtesy, openness, and friendliness.
Clementia
"Mercy" Mildness and gentleness.
Dignitas
"Dignity" A sense of self-worth, personal pride.
Firmitas
"Tenacity" Strength of mind, the ability to stick to one's purpose.
Frugalitas
"Frugalness" Economy and simplicity of style, without being miserly.
Gravitas
"Gravity" A sense of the importance of the matter at hand, responsibility and earnestness.
Honestas
"Respectibility" The image that one presents as a respectable member of society.
Humanitas
"Humanity" Refinement, civilization, learning, and being cultured.
Industria
"Industriousness" Hard work.
Pietas
"Dutifulness" More than religious piety; a respect for the natural order socially, politically, and religiously. Includes the ideas of patriotism and devotion to others.
Prudentia
"Prudence" Foresight, wisdom, and personal discretion.
Salubritas
"Wholesomeness" Health and cleanliness.
Severitas
"Sternness" Gravity, self-control.
Veritas
"Truthfulness" Honesty in dealing with others.
I recognise in these Roman virtues (the list varies) the values my folks taught me as a child, though of course nobody could tell where these values came from. They have little to see with Christian values, but are very similar and probably share the same origin as the Norse pagan virtues (see
Nine Noble Virtues).
Therefore, coming up with a non-christian value system is not really difficult: our "western" value system was never that strongly influenced by Christianity to start with. It was always much more strongly rooted in Indo-European "virtues".