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I think you should take a look at "The Next Generation" here:
http://lythgoes.net/genealogy/software.php
In my opinion it seems more powerful than geneweb. Clip from the FAQ:
Are there plans to support other content management systems (besides PostNuke and PHPNuke)?
There are no definite plans, but it could happen. I would certainly like to accommodate as many such systems as possible. If you would like to assist in a port to your favorite system, please let me know.
Stop FAQ