Updating add-on products for Plone 4

This is a list of the most common updates that need to be applied by product authors to ensure that their products work on Plone 4.

1. No more global definitions in templates
2. The action icons tool (portal_actionicons) has been deprecated
3. No more Zope 2 interfaces
4. Miscellaneous import changes
5. Validators
6. Manual calls to translate
7. Use plone.app.blob-based BLOB storage
8. Add views for content types
9. 'MailHost.secureSend' is now deprecated; use 'send' instead
10. Portlets Generic Setup syntax changes
11. Updating Plone 3 themes for Plone 4
12. New users and groups functionality
13. Make sure your templates are XHTML compliant

All content on one page (useful for printing, presentation mode etc.)