The following websites are especially helpful:

Transportation Demand Management
The Victoria Transport Policy Institute offers a progressive and comprehensive approach to transportation, based on full accounting for costs and benefits. VTPI is the leading source of information on TDM and VMT reduction. VTPI's Executive Director, Todd Litman, has written Parking Management Best Practices, a very helpful guide to the efficient use of land, and to integrating parking into a world of transit-oriented development. A short version of the book is available online.

Transit-Oriented Development
The Metropolitan Transportation Commission in the San Francisco Bay Area has published a series of helpful guides:
A conference on parking reform made a range of resources available, including a handbook/toolbox on reforming parking policies to support Smart Growth.
New Places, New Choices:Transit-Oriented Development in the San Francisco Bay Area.

National Commission
The National Surface Transportation Policy and Revenue Study Commission produced its Final Report, which contains very forward-thinking recommendations calling for a fresh start with federal transportation programs, a focus on performance outcomes, and congestion pricing.

Peak Oil
For a Primer on Peak Oil.
For a short
introduction to Peak Oil and a set of links to resources.
Global Public Media carries news about Peak Oil.
The
Post Carbon Institute is a leading site on preparing for a world that doesn't depend on fossil fuels. An important focus is on bringing our lives back to a local focus, which they call "relocalization."
James Howard Kunstler has written and spoken extensively on Peak Oil. The Long Emergency, his book-length exposition of the eventual devastating impacts of Peak Oil on the American way of life, is highly recommended