Hi folks,
For those who want something a bit more mellow than crazy space battle stuff, here is a downloadable sample for XNA Game Studio Express - you'd still use XACT to create the content. There are a few less triggers than in 'Space War', but there's definitely some cool opportunities for expansions and more subtle sound design if you're interested.
http://creators.xna.com/Education/StarterKits.aspx
-Scott