List of changes (from the mailing list)
What's new:
* fixed a bug with subdomains that was caused by the inability to
specify the server name. The server name can now be set with the
SERVER_NAME config key. This key is now also used to set the
session cookie cross-subdomain wide.
* autoescaping is no longer active for all templates. Instead it is
only active for .html, .htm, .xml and .xhtml. Inside templates
this behaviour can be changed with the autoescape tag.
* refactored Flask internally. It now consists of more than a single
file.
* flask.send_file() now emits etags and has the ability to do
conditional responses builtin.
* (temporarily) dropped support for zipped applications. This was a
rarely used feature and led to some confusing behaviour.
* added support for per-package template and static-file directories.
* removed support for create_jinja_loader which is no longer used in
0.5 due to the improved module support.
* added a helper function to expose files from any directory.
Online Documentation: http://flask.pocoo.org/docs/
Downloadable PDF: http://flask.pocoo.org/docs/flask-docs.pdf
Website: http://flask.pocoo.org/
On Github: http://github.com/mitsuhiko/flask
PyPI Record: http://pypi.python.org/pypi/Flask