Modern Roundabouts Web Site - Maintained by Kittleson & Associates. 

Includes an inventory database of modern roundabouts in the United States, and resources and contacts on the topic. 

http://roundabouts.kittelson.com

Managed Lanes Screening Tool - Developed by Texas Transportation Institute
Provides a preliminary screening instrument for project managers that helps define the types of managed lanes strategies that would be conducive for a given corridor.

http://managed-lanes.tamu.edu/products/MLScreeningTool.zip

Comprehensive List of Managed Lanes Projects - Maintained by the TRB Joint Subcommittee on Managed Lanes (AHB35(1))
Includes information on location, length, and website information on U.S. managed lanes projects with a pricing component.

http://managed-lanes.tamu.edu/related_work/TRB/Inventory/Comprehensive_Listing_of_US_MLs-19Feb07.pdf