Two ideas just popped into my head. Gotta write them down.

1. Take advantage of Google's algorithms to search the scriptures. In Google's search box, type some terms followed by "site:scriptures.lds.org". The most popular relevant verses float to the top. This idea led to a bookmarklet to Search Scriptures. (Bookmark that link and place the bookmark in your toolbar. See http://bookmarklets.com for more information on bookmarklets.)
2. A genealogy toolbar for Firefox might be cool. I'm not yet sure what it would do. :-)