Dustin Miller has this great post - Don't forget: Web Services/SOAP isn't the only path to XML from SharePoint. The key point is that the lists in WSS are exposed in their XML format by the owssvr.dll, so that you can view their XML in the web browser (of limited use) or use that URL as a source for the Data View web part in a different WSS site (kind of like a poor man's RSS feed).
We had a client recently ask about how to bring data from multiple sites into one summary site, and we had looked at building a custom web part for that purpose. This gives us some other options.
Note: At the moment this isn't working for me - it seems that the data view web part doesn't want to see this as a valid XML file.
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