It is simple and easy-to-use and includes an easy way to bring other family members into the discussion via email. I know from my own research that documenting everyone in the family usually falls to one interested party, so a little collaboration would be helpful.
Geni is a bit limited, as you can't yet import or export the GEDCOM files mentioned above. These are a standard data format used by almost all serious genealogy folks. Still, it is fun to play with and could become yet another great online service to replace the traditional PC-based applications we are all used to using today.
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