Windows SharePoint Services ships with some really powerful web services that allow users to access list and site information not available through other means. FrontPage 2003 allows users to access these web services in a very straight forward manner, populating all of the query fields dynamically so that little or no knowledge of SOAP is required.
This example here describes how to use the Data View Web Part to access the lists.asmx web service to display the Attachments on list items in wss. In order to make this as easy to describe as possible, I will use the Announcements list.
So, to start, I browse to the announcements list on my server: http://myserver/subsite/lists/announcements/forms/allitems.aspx and add a new announcement. The title is 'foo' and I click to add an attachment which is called attachment.htm. By default, I now have two announcements in my list, one with title "Welcome to Windows SharePoint Services..." and one with title "foo." I open this site in FrontPage 2003 and create a new blank page on which to work.
I hope that this introduction to web services in SharePoint and FrontPage inspires you to check out all the other methods. Let us know what problems you've solved by using these web services!