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Publishers of well known international series of travel guides often have their own web sites. Some just serve as a sales tool for the books, others, however, offer comprehensive, easy accessible and current information about the destinations described in the books. The information can help you pick a destination (and a guide book), but also gives you updated and extra information that's not (or not yet) in the books.  
Rough Guides  
Very comprehensive site with information on more than 4,000 destinations. Very useful beside the books, but also in its own right. The texts from many of their books is available on-lne, but more easily accessible. Rough Guides cover the well known sites, but also covers the less beaten tracks. For travellers with a broad interest, from budget traveller to upper mid range. Rough Guide publishes Country and Regional guides, but introduced recently Mini-Guides on cities. Beside that there is also a series of phrase books and themed guides (Internet, Women, Music, Millennium etc).  
Lonely Planet  
The Lonely Planet site gives a brief impression of the content of the books published by them. Complete with photographs. The Lonely Planet guides are similar to Rough Guides', boht in range, style and interests. My impression, though, is that LP is more concerned with your budget and prefers cheaper accommodation and restaurants and other ways to cut costs.  
Time Out  
Time Out guides are a spin-off from the London magazine with the same name. They are city guides with emphasis on going out. Eating, drinking, dancing, music, theatre and shopping, they all get a good deal of attention. But the cultural sights are not forgotten, but the guide books do not deny their origins. The web site gives you good, up-to-date and easy access information on the cities covered by the guide book series.

There is also a possibility to place personal adds.

 
Frommer  
These guides primarily target the budget travellerr. The site is sort of travel magazine, with articles, tips, ideas (from fellow travellers), offers and infromation about and by travel operators.  
City.net  
On line travel informtion by search engine Exite. Not always that reliable and often slow, because it a collection of hyperlinks to other suppliers of information. It's mainly city information on accommodation, restaurants, sigths and the weather.