apply Pygments highlighting to the source
  code displayed in the traceback, if Pygments
  if available.  Courtesy Ben Trofatter
  [ticket:95]

  i.e. "% with x as e:/ % endwith" support.
  Courtesy Ben Trofatter [ticket:147]

  nesting multiple def-calls with content.
  Thanks to Jeff Dairiki. [ticket:186]

  to filehandles being implicitly closed.
  [ticket:182]

  Cache() constructor, which was preventing file
  version checks and not allowing Mako 0.6 to
  recompile the module files.

  (even though several of those old template libs aren't
  available on Py3K, so YMMV) [ticket:175]

  in templates.   Usage of regions should be considered
  as superseding the very obsolete idea of passing in
  backend options, timeouts, etc. within templates.
- rewrite the cache docs again which had a lot of misleading/inaccurate
info.

- same root url fix

  TemplateLookup, allows a callable to be passed which
  takes over the writing of the template's module source
  file, so that special environment-specific steps
  can be taken.  [ticket:181]

  for code blocks so that indentation is preserved
  [ticket:173]

  is now escaped with the HTML filter. [ticket:142]

  within extra arguments to <%block>, <%def>, i.e.
  <%block name="foo" cache_key="${somekey}">.
  Filters can also be used in this way, i.e.
  <%def name="foo()" filter="myfilter">
  then template.render(myfilter=some_callable)
  [ticket:180]

  script, allows passing of kw to the template from
  the command line. [ticket:178]

pkg_resources API feels very fragile

I really want to do it like this