A rewarding activity is to share your research with others. This can be your immediate family or other researchers who share your ancestry. Here are some types of online collaboration:

Social Networking for Genealogy

Geni. Geni is a free online tool for understanding and staying in touch with your family. Geni lets you create a family tree through a simple interface. You can expand your tree by adding relatives' email addresses. They will be invited to join your tree and can add other relatives. Your tree will continue to grow as relatives invite other relatives.

Genealogy Forums

You can find all sorts of information at these Forums. They are definitely worth browsing. Two that are particularly useful are:

Other Options

Surname Community. Here you can join with your relatives around the globe in building and contributing to your surname tree.  Click here for more information on the Surname Community at Ancestry.com.

OneGreatFamily.com. OneGreatFamily is a cooperative effort between you and the rest of the world. It is an online genealogical service which allows people to combine their knowledge and data to build one huge, shared family tree database. OneGreatFamily is more than a simple collection of different family trees. It is actually linking all of the family trees together into one great family. 

Also see

Genealogy on the Internet