As Geni.com's Website says:
Geni is solving the problem of genealogy by inviting the world to build the definitive online family tree. Using the basic free service at Geni.com, users add and invite their relatives to join their family tree, which Geni compares to other trees. Matching trees are then merged into the single world family tree, which currently contains nearly 50 million living users and their ancestors. Pay services include enhanced research tools as well as keepsake products created from family tree data. Geni welcomes casual genealogists and experts who wish to discover new relatives and stay in touch with family.
With Charting Companion for Geni, you can publish and share your research with these great-looking charts: