URLs are now as short and as human-comprehensible as possible. Also, the URLs for book and collection home pages (tables of contents) and the URLs listed under collections and the Subject Categories, Titles, and Product Categories tabbed links are now guaranteed to remain stable. Examples of stable URLs are:
http://docs.sun.com/coll/47.11
http://download.oracle.com/806–6468
http://docs.sun.com/prod/soft
http://docs.sun.com/subj/user_solaris
http://docs.sun.com?p=coll/47.11
http://docs.sun.com?p=doc/806–6468
http://docs.sun.com?p=prod/soft
http://docs.sun.com?p=subj/user_solaris
As long as you do not link to a point down inside a book (which can always be updated in place), your links and bookmarks are safe.
If you are a technical writer or web master, this stability enables you to include links to Sun product documentation in your documents and web pages.