If you follow the Python2.7 getting started guide, you get to the templating part here. For me on Ubuntu 11.10 I would get a horrible stack trace that ended with:

  File "/home/fratrik/code/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 1571, in LoadModuleRestricted
    description)
  File "/usr/lib/python2.7/dist-packages/jinja2/utils.py", line 587, in <module>
    from jinja2._markupsafe import Markup, escape, soft_unicode
ImportError: No module named _markupsafe

The important part is actually at the top:

ERROR    2011-11-13 00:48:12,767 dev_appserver_import_hook.py:1386] Third party package markupsafe must be included in the "libraries:" clause of your app.yaml file in order to be imported.
google-app-engine
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