Business Traveler Online
Combining lively features with destination information, especially for Europe.

Doing Business Abroad
Leading discounter - sometimes has rooms at hotels listed elsewhere as sold out

Economist City Guides
Destination advice from a leading business magazine.

Joe Sent Me
Business travel news and commentary from top biz-travel journalists including Joe Brancatelli.

SkyGuide from American Express
Airport sites, flight tracking, cultural advice, even resources for saying in shape on the road.