Have you tried using Calibre's catalog function?
https://www.mobileread.com/forums/showthread.php?t=71143
You can create a single epub file that will have descriptions for all your books.
I also like flicking through book descriptions, and I used to use a plain text file for it which I had to update by hand, until I found the catalog feature.
A built in feature on the 360 would be nicer, though.