You may have guessed already that we think DS-DS multiplayer is very important to the homebrew scene. Well, we are not the only ones promoting it. Since the beginning of last month, you can download liblobby directly off of the PAlib website: http://palib.info/forum/modules/PDdownloads/singlefile.php?cid=3&lid=39 (when it comes back up :P). We don't use PAlib but the spread a multiplayer library is always good news.
Also, the game Tetattds claims multiplayer support with liblobby. We haven't checked it out ourselves but go have a look: http://code.google.com/p/tetattds/.
Things are moving along faster than expected here. We will most certainly make our March deadline.