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The case of the SharePoint Conference in Peru is interesting. The public facing Web site helps to get information: attendee registrations, speakers, sponsorship requests.
The Intranet of the site merges that information with operative information: Invoices to send, customers contacted, invoices paid, list of participants, expenses.
The site is organized for a team of people that works on it remotely: Europe and South America.
The site is based on SharePoint and developed by B4Contact.