Finished the regular campaign tonight. The last mission was a total blast - nice relief after the bitch of a penultimate mission. The credits music is amazing and a fantastic example of what the DS is capable of outputting. GDJustin posted a link for the music in another thread but it's since moved so I found the new link:
http://www.advancewarsnet.com/awdsmusic.shtml
Now to play through hard campaign and sharpen my skills for some versus play with Cormacaroni and DCharlie. After all's said and done, I think the stylus and second screen worked well with the game. There was one mission where the sub-area battle seemed impossible, but I think if you control it yourself and send enough units up there you can probably succeed.