The music section has been updated with a short description for each download page. Those descriptions have a few details about the various games from where those tracks come from. Sorry, but there are no new songs available for download at this point!
I thought I would post this update to answer a question that many of you could be asking: at this point, there are no Battle Network 4 maps available online. The creator of the maps from the previous games, MegaBoy, hasn't done any yet. However, BradyGames is publishing an help guide for MMBN4 that contains detailed maps. You should be able to find this guide in your favorite game stores within a few days, if it's not already available.