Do you really know what you can take in and out of Algeria, or Spain, or Argentina? Visit the all nations guide at http://www.excess-baggage.com.
Want to make or receive calls while traveling internationally? Check out http://www.howtocallinternational.com. This works for mobile phones, landlines, and Skype.
Need to know how to get a passport or visa in a hurry? These people have been in the business for over 20 years. http://www.traveldocs.com
Looking for information about world airports and terminals? Check out www.worldairportguide.com.