Fiction:

The Dispossessed by Ursula K. Le Guin is a great start (good critique of anarchist philosophy).

The Red Mars Trilogy by Kim Stanley Robinson actually cites Mondragon and discusses cooperative economics in detail.

After The Deluge (of Critical Mass fame) by Chris Carlsson is a novel about a post-capitalist San Francisco.

Non-fiction:

After Capitalism by Seymor Melman.

America Beyond Capitalism by Gar Alperovitz.

Democracy at Work: A Cure for Capitalism by Richard Wolff.

Capitalism's Crisis Deepens: Essays on the Global Economic Meltdown by Richard Wolff.

After Capitalism by David Schweickart.

Against Capitalism by David Schweickart.

Capitalism or Worker Control by David Schweickart

Putting Democracy to Work by Frank T Adams.

Collective Courage: A History of African American Cooperative Economic Thought and Practice by Jessica Gordon Nembhard.

Humanizing the Economy: Co-operatives in the Age of Capital by John Restakis.

Owning Our Future: The Emerging Ownership Revolution by Marjorie Kelly.

For All the People: Uncovering the Hidden History of Cooperation, Cooperative Movements, and Communalism in America by John Curl.