Mike Gannotti recently cornered Allan Schweighardt & me at a conference in Seattle, WA, earlier this month. He asked me why customers should consider using SharePoint on the Internet. Here's a link to the video interview: http://sharepoint.microsoft.com/blogs/mikeg/Lists/Posts/Post.aspx?ID=1508 

One of the resources I mention is the list of SharePoint sites on the Internet. Keep in mind - this is not complete and may not be 100% accurate. Check it out @ http://www.wssdemo.com/Pages/websites.aspx