Pinpoint properties on a map.

Cons

You can't search for more than one city at a time..

http://www.hotelscombined.com

A meta-search enginefor hotels that includes customer reviews. The site, which has its headquarters in Sydney, Australia, launched in 2005 to offer travelers one-stop shopping for hotel deals.

Pros

Easy-to-use price and location filters.

Price comparisons and offers available from multiple suppliers.

Cons

Lacks a default so you must enter the number of travelers or rooms.

http://www.oyster.com

This website provides in-depth reviews and photographs of hotels. Its 14 destinations include Hawaii, New York City, Boston, Washington, D.C., and San Francisco. A popular site feature is photo fake-outs that compare a hotel's photographs to photos taken by Oyster's reporters, says chief executive Elie Seidman.

Pros

Concise reviews that offer pros and cons.

Numerous photographs to help you choose where to spend your hotel dollars.

Cons

Only 14 destinations, but Seidman promises more will be added.

http://www.airbnb.com

If Couchsurfing and Flipkey had a love child, it would be Airbnb. Co-Founder Brian Chesky says Airbnb "began with an airbed in our living room." Lodging options range from an airbed in a living room to a real bed in a home, igloo, tepee, tree house or castle. With accommodations listings in 2,751 cities in 117 countries, Airbnb functions more like a hotel booking site accepting payment via Paypal, credit card or bank transfer.

Pros