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+* Extension that does something like this:
+
+      def build(*)
+        if settings.memcached?
+          use Rack::Cache, :backend => :memcached
+          use Rack::Session::Memcached
+          # ...
+        end
+        super
+      end
+
+* `sinatra-smart-cache`: update cache header only if arguments are more
+  restrictive than curent value, set caching headers that way for most helper
+  methods (i.e. `sass` or `send_file`)
+
+* Some verbose logging extension: Log what filters, routes, error handlers,
+  templates, and so on is used.
+
+* Form helpers, with forms as first class objects that accepts hashes or
+  something, so the form meta data can also be used to expose a JSON API or
+  similar, possibly defining routes (like "Sinatra's Hat"), strictly using
+  the ActiveModel API.
+
+* Extend `sinatra-content-for` to support Liquid, Radius, Markaby, Nokogiri and
+  Builder. At least the first two probably involve patching Tilt.
+
+* Have `sinatra-namespace` support namespace local templates.