Tuesday 05 February 2008 8:37:26 am

Most of the features you talk about is right there out of the box, at least:
* user management
* user group management
* content/download for documents and files
* roles for specifying read / write /edit / delete rights pr user or user group and where they have those rights and on what kind of content ( article / forum / calendar ....)
* Forum
* Calendar

As for newsletter, there are several extensions available, and most of them integrate well with the content of your site.

When it comes to chapters, this highly depends on what you mean. Is this just site sections or independent web sites ? Do they differ in design or do they share design?

If they need to be independent from each other in design / style / layout / domain, then you need to do some customization. Here is one way to do it:
http://ez.no/developer/forum/setup_design/valentin_s_multisite_guide_v_1_example_uses_ezp_v_3_9_4

eZ Online Editor 5: http://projects.ez.no/ezoe || eZJSCore (Ajax): http://projects.ez.no/ezjscore || eZ Publish EE http://ez.no/eZPublish/eZ-Publish-Enterprise-Subscription
@: http://twitter.com/andrerom