-HTTP Server
For configuration and information on the xbox, this would be neat
-IRC Addon
how about being able to share the games off the HDD ? i.e making DCC for ava users possible to send a complete directory, one file per file.
So we could see how big it is in total, file count, kb/s ?
That would be cool for sharing apps between xbox users. and using your own CTCP's for special info it would not display when not in some sort of debug mode.
-News Client
would be cool to add some RSS news feeds, and it scrolling them on top.
Being able to add some manually would be cool

-Multitasking
Running Several apps ?! that would rock, thats the next big step xbox dashboards could/would do

Thats my grain to the soup, hope some of em will be implemented