The top-level Package Index file (i.e., packages.html) would be more useful if each package listed were augmented with a brief summary of that package.  This is analogous to the one-line summary information that appears for the Field, Constructor, and Method Indexes at the top of each class file (i.e., <package-name>.<class-name>.html).  This will be especially useful when javadoc is once again used to generate hardcopy documentation (such as -doctype MIF).