For airfares:
>> Kayak.com
>> Momond.com
>> YAPTA.com
>> WeGoLo.com (for fares within Europe)
For rental cars:
>> www.bnm.com
>> www.priceline.com
For hotels:
>> www.hotelscombined.com
About Pauline Frommer:
Pauline Frommer is the creator of the Pauline Frommer's Travel Guides, the award-winning guidebook series aimed at adult budget travelers. Pauline Frommer's New York City and Pauline Frommer's London were named "Best Guidebook of the Year" by the North American Travel Journalists Association in 2006 and 2007 respectively. She was the founding editor of Frommers.com and her byline has appeared on hundreds of articles for such publications as Budget Travel, Marie Claire, the Dallas Morning News, and MSN.com. Currently, she hosts a nationally syndicated radio show on travel and appears weekly on CNNOnline. In addition, she has appeared on Live with Regis and Kelly, 20/20, The Today Show, The Early Show, The CBS Evening News, CNN, FOX, MSNBC, and just about every local news station you can name.
