1) A tour sort of thing. A few pages, complete with screenshots and easy to understand instructions, showing different areas of the site and how to use them. This would draw more newbies to the downloadable clients and probably lessen the number of stupid support requests
2) Brad had mentioned in #livejournal that the livejournaldish girl agreed to do random summaries of entries for the new front page. There should be an option for people to sign up.. not everyone wants their journals up there, and some people want it more than others. Perhaps as an option in the personal info?