Cyndis List
If you want to research a specific area of genealogy then this is DEFINITELY the site for you!  Cyndi categorizes links by every possible criteria imaginable.

FamilySearch.org
This site contains the IGI, Ancestral File, Pedigree Resource File and other Vital Records complete with search engine.  It also has many research outlines free for you to download.  And, don't forget to download a FREE version of PAF 5.1 Family History software while you are visiting.

Rootsweb
One of the leading genealogy sites, this site contains the Roots Surname List, an absolute must for those doing family history.  New on this site are the GenConnect Boards which are free notice boards by surname and other common interest groups.  

FreeBMD.rootsweb.com
This site allows you to search the UK Civil Registration Records for births, marriages and deaths.  This index is currently incomplete but is growing all the time due to the large number of volunteers contributing to it.

www.fhsc.org.uk/genuki/REG/
This site provides the addresses for applying for UK Civil Registration certificates at 1/2 price!

GenUKI
A virtual reference library of information relating to genealogical research in the United Kingdom and Ireland.

Family Tree Maker
One of the leading genealogy programs, Family Tree Maker's web site has lots of useful links, tips & tricks and even user web pages.

National Institute for Genealogical Studies
One of the leading certificate programs in genealogy studies that can be taken online.