One of the tweaks Weber writes about is the addition of more Dublin Core metadata to THOMAS records.
One thing this will help with is the new Library of Congress search system, which now can search all of the legislation in THOMAS (and quickly shows that there are 232,294 items). You can then filter the results by date or contributor (Member of Congress). Also, you can see the number of items for each of the facets. This page is a helpful tool to see how many items a Member has sponsored since data starts in THOMAS.
You can review all of the enhancements in this post from In Custodia Legis.