There is simply no comparison between a purely auditory medium and the web. The text quoted by Webwork is a good summary of the complaint. It is important to understand that the web is overwhelmingly a text-based environment, and as such is inherently accessible because the data can be displayed on a screen, resized, displayed in different colors, read out by a screenreader or displayed on a braille device. Problems occur when you take that accessible information and present it in a way which reduces its accessibility.
The lawsuit didn't come about because the site was a bit difficult to use, but because the way it was built actively discriminated against blind users by failing to cater for "very basic components" - alternative text for images and - to quote - "the denial of keyboard access". This is active discrimination, not passive inaction.
This is an important step, an excellent decision, and I hope the case goes forward and the case for website accessibility wins in the long term.
[edited by: encyclo at 4:18 pm (utc) on Sep. 8, 2006]