I would like to download a forum on an ongoing basis. There are two types of
pages: 
- list view
- message view

The list view shows 10 threads per page:
<http://www.site.com/categories.cfm?catid=3>
<http://www.site.com/categories.cfm?catid=3&PAGE=2>

The message view:
<http://www.site.com/messageview.cfm?catid=3&threadid=20185>

The list view is in reverse chronological order. What's on page 2 to-day, is
on page 3 to-morrow.

As the list pages are constantly changing I can't see the point in downloading
them. The best I can think of is downloading the threads into a category
folder:
 /.../www.site.com/catid3/messageview20185.html
and then generate list views to navigate these pages.

Does anyone have a better idea?