Where is the best genealogy web site ?

Answer 1

The best subscription website (if you can afford it) is:
http://ancestry.com/

Free sites (with various limits of the information they can supply include:

Family Search
http://www.familysearch.org
Search the Family History Library's database, which contains millions of names from thousands of family trees.

GenCircles
http://www.GenCircles.com
Searching the global tree and viewing results is free to everyone. In addition to first and last names, the database is searchable by dates and places of birth, baptism, marriage, death, and burial, as well as by the names of an individual’s father, mother and spouse.

GeneaNet
http://www.geneanet.org
A database that indexes all the world's genealogical resources, whether Net-based or not and whether free or fee-paying.