These modules work well in in making it easy to upload any image, the resizing is sorted for you and multiple versions are created for different used eg thumbnail size, main image etc - see:
http://blip.tv/file/316842 (change to full screen)
http://www.screencast.com/users/artatac/folders/Default/media/608f3f82-4... (currently used all the bandwidth!)
Regards
Joe
~billfitzgerald -- Joe -- a great screencast -- very thorough and precise, and in answer to your last line, "I hope this has been useful," the answer is a definite yes -- as I mentioned via email, we are looking to replace node_images with CCK imagefield and imagecache --
WRT the css you added to the system.css in modules/system -- I'd recommend adding that to style.css of your themes' stylesheet, or creating (and importing) a custom.css that lives outside core code -- that way, you won't run the risk of overwriting it during core code upgrades.
This is a great piece of documentation, and thank you for sharing this back.