+* wiki info page, giving the ikiwiki version etc
+* would it be useful to reimplement the hyperestradier search integration as a plugin?
+* Support [[RecentChanges]] as a regular page containing a plugin that updates each time there is a change, and statically builds the recent changes list. (Would this be too expensive/inflexible? There might be other ways to do it as a plugin, like making all links to RecentChanges link to the cgi and have the cgi render it on demand.)
+* etc
+* For another type of plugin, see [[todo/PluggableRenderers]].
+
+Another, separate plugin system that already (mostly) exists in ikiwiki is
+the RCS backend, which allows writing modules to drive other RCS systems
+than subversion.
+
+## preprocessor plugins
+
+done
+
+## case study: Moin Moin plugins