An extensive database compiled and uploaded by David A. Haskell containg over 7,000 entries for the Haskell surname. David's Family Tree Maker website has some background information about his research.
A non-profit group(of which I am a member) dedicated to research of the Haskell surname, membership is fairly inexpensive and they offer a quarterly newsletter. Their latest reunion was held April 21/22, 2006 in Charleston, South Carolina and plans are already underway for the next reunion.
A worldwide organization, they hold annual reunions in England open to member and non-members alike. I don't belong but have exchanged emails and letters with some of their members over the years. They also publish a quarterly newsletter for their members.
A genealogy mailing list for the discussion and sharing of information regarding the Haskell surname in any place and at any time, as well as those ancestors who married into Haskell lines.
A search driven website operated by the Church of Jesus Christ of Latter Day Saints. This site's easily searchable database includes a great deal of official records that have been catalogued by the church. It also has some free software available that will get you started on creating a family tree and there's no pitch to become a member or anything of that sort.
Another free genealogy resource. This service gives you a quick way to create an online family tree and allows you to set up sites relating to genealogy free of charge.