A good traveler has no fixed plans, and is not intent on arriving. ∼ Lao Tzu

Thanks to the [U.S.] Interstate Highway System, it is now possible to travel across the country from coast to coast without seeing anything. ∼ Charles Kuralt, On the Road With Charles Kuralt

U.S. Highways & Roads:
mapquest.com
us-highways.com
ugcs.caltech.edu/~jlin/signs/usa/
kurumi.com/roads/3di/3di-primer.html
aaroads.com/kick-off/highway.html
misc.transport.road FAQ
DMOZ Roads and Highways
U.S. Interstate highway System
Map of U.S. States

Other Stuff:

roomkey.com
hipmunk.com
tripadvisor.com

mobissimo.com
sidestep.com
cheapflights.com
kayak.com
farechase.com
bestfares.com
lowestfares.com
virtualtourist.com
IGoUGo.com

Discovery Travel
LonelyPlanet.com
History Chanel Travel
Travel & Leisure.com
IslandInsider.com
IslandInfo.com
ResortIslands.com
Great Outdoor Recreation Pages
WorldHum.com

Sidestep.com
Expedia.com
Arthur Frommer's Budget Travel
Fodors.com
Travelocity.com
hotwire.com
orbitz.com
hotels.com
motels.com
Yahoo! Travel
Site59.com

itasoftware.com
smarterliving.com
concierge.com
onetravel.com
fairair.com
iexplore.com
railtrails.org

Inns:
selectregistry.com - Distinguished Inns of North America
Seal Cove Inn - Northern California

Reno and Tahoe:
gotorenotahoe.com
Siena Hotel and Spa
Eldorado Reno

Travel Books:
wizardpub.com

Time Shares:
rci.com

Cognitive Travel

Space:
Nasa Astronomy Picture of the Day
Cosmiverse.com
Windows to the Universe
NASA Structure & Evolution of the Universe
Nasa's Astronomy Picture of the Day
Best of the Hubble Photos
Hubble Heritage Image Gallery
hubblesite.org
Yahoo! Hubble Links
SETI.org
Stephen Hawking's Universe
The Nine Planets
Ned Wright's Cosmology Tutorial
NASAwatch.com