I may've misunderstood your question. In order to see the list of packages that are part of the tarball, go to the package manager and click on "install packages". That will cause your computer to spin its wheels for a bit, and after a suitable delay a list of packages with "install" and "enable" checkboxes will appear in your browser.
Be warned that in the Oracle version you can't install all packages at once, because the list of packages overflows the varchar used to hold it (varchar's in Oracle are limited to 4000 characters). You'll get a nasty Tcl stack dump if you try to do so. If you're using the PostgreSQL version you can install all packages at once - though it does take awhile.
And if you're using CVS or a nightly tarball check the status page to see which packages actually work with which RDBMS. The alpha tarballs are massaged so that you only see the right ones in the package manager, but this isn't true of the working sources.
