Sites I Like

Accomodations:

www.homeaway.com
www.flipkey.com
www.VRBO.com

Travel Blogs:

www.globetrottingmama.com
www.theprofessionalhobo.com
www.goinganyway.net
www.greatfamilyescape.com
www.projectmojito.wordpress.com
http://www.livingthedreamrtw.com/
http://www.neverendingvoyage.com/

Travel Advice Sites:

http://www.bootsnall.com/
http://www.travelforkids.com/
http://www.independenttraveler.com/
http://www.enjoy-europe.com/
www.tripadvisor.com

Transportation:

http://www.seat61.com/index.html  comprehensive guide to train travel around the world
www.airtreks.com  around the world travel experts for booking RTW plane tickets
www.skyscanner.com  good fight search engine that picks up bargain airlines, consolidator sites

Travel Gear/Packing Advice:

http://www.onebaggirl.com/
http://www.1bag1world.com/
http://www.scottevest.com/
http://id-inside.com/  wristband with hidden pocket for ID information (in case child gets separated from you)