Probably (Depending on where you want the portlet) you can add a portlet manager.
I made something once that should work:
(there should also be 'belowcontentportlets' in the same add on.
Other options are:
- Move the content of a portlet with diazo
- in a browser view either <div tal:replace='structure or /path/to/conent/@@another_view or ajax_view
- pat-inject or pat-contentload (pat-inject can load content 'automagically, pat-contentload needs a click (or a javascript 'clicking)... I think)
PS: Sometimes you can get away with a 'all contents view' on a smart folder (Collection)