The kind of product and service that you really need to see to get your head around, but the blurb sounds very interesting.
Google Noticeboard is an application that helps people access and share information over the Internet using public digital noticeboards. Using Google Noticeboard, communities can access a variety of relevant information. People can create text messages or record voice snippets and post them to one or more noticeboards.
Communities with access to shared computers can use the Noticeboard for exchanging messages related to community announcements, social interactions, local buying and selling, and information that is of wider interest to the community. The Noticeboard may also be used for the community to engage in a dialog with benefactors, public servants, and other service providers who are geographically distant. For example, residents of an apartment complex can use the Noticeboard for posting announcements, or NGOs who own and operate computer centers in several villages can use the Noticeboard to enable village residents to communicate amongst themselves.
Check out Google Noticeboard here.
Now why would they make this run on XP only? Surely, one that runs on a Linux distro (e.g. Ubuntu) makes sense?