There's the Newest Nodes RSS Feed. If you want only SOPW, or other certain section(s), note that it obeys the filter list defined in your Newest Nodes Settings. So if you want your RSS feed pull to select a different set of sections than your normal NN view, you'll have to do some fancy footwork with setting and resetting your NN configuration. Otherwise, you could filter the results on the client end by the <category> field.