Property Bag Stuff and SharePoint 2010 Web Services

If you need to access a site property that is stored in the "property bag", you're not going to be able to use any of the SharePoint web services to get at it.  Unfortunately, the only way this is possible is through the object model (specifically SPWeb.Properties).  And of course, this code has to run on the web server.  The advantage of the web services is you can run them anywhere, but as you can see, there are some limitations.