I've been looking into Digital Asset Management to better organise my images and came across this site called
dpBestflow. One of the main contributors is Peter Krogh, author of the highly regarded book "Digital Asset Management for Photographers".
It's not specifically for astro, but all photography.
It covers every aspect you can think of. From what to consider in terms of your computer, camera, software, backup solutions, cataloging, workflow, keywording and rating your images. Very thorough.
Just thought I'd share.