Theoretical Space Science
This site has some ideas on some alternative science and unconventional science topics such as free energy, over unity machines, space travel, mathematics, computer science and perhaps time travel.
http://science.radioelectronics.biz/

Space Travel and Exploration
Discover and explore the universe: planets, star systems, black holes, cyberspace, ISS, space shuttle, rockets, satellites, and telescopes.
http://www.spacehike.com/

Space Transportation
NASA Marshall is leading the space transportation revolution by developing technologies to make future space transportation like today's air travel.
http://www.spacetransportation.com

Space-Time Physics and the Future of Time Travel
Elementary exposition of Euclidean geometry, Newton vs. Einstein, and the possibility to travel into the future, and see into the past, in relativity. By Alex MacLellan.
http://themaclellans.com/timetravel.html

StarTiger
An European Space Agency initiative in partnership with the Space Science and Technology Department at CCLRC Rutherford Appleton Laboratory. Features project description and results of an experiment in making TeraHertz imaging devices.
http://www.startiger.org/

Travel Careers and Travel Classes at WLAC Travel School
As one of the largest travel school programs in the nation, West Los Angeles College department of travel provides travel classes and information on travel careers.
http://www.travelclasses.com/

IdDeals - Travel Deals for Travel People
idDeals.com travel industry interline discount hotel rates for airline employees, travel agents and nonrev travel
http://www.iddeals.com/

TravBuddy
Honest hotel reviews, millions of travel buddies, and thousands of travel blogs to help plan your next trip. Share travel tips, find a travel buddy, or blog about your travel experiences, all for free.
http://www.travbuddy.com/

Travel Guidelines
Specifies how to organize and where to place travel sites. This includes lodging, travel agents, tour operators, travel guides, transportation, and travelogues.
http://www.dmoz.org/guidelines/travel/

The Federation of International Youth Travel Organisations
FIYTO - an open, world-wide, non-political and non-sectarian travel trade association advocating the special identity of young travellers, and their right to flexible, affordable travel and travel-related services.
http://www.fiyto.org/