Website Accessibility a Legal Issue?

geekwithsoul asks: "Target is being sued because its website is not usable by the sight-impaired. While this story from the San Francisco Chronicle is from February, I've seen surprising little coverage of it in either mainstream or tech-focused media. Is the threat of legal action the only really effective way to get companies to create accessible (and thus standard-compliant) websites?" "From the article:

'Advocates for the blind said the lawsuit is a shot across the bow for retailers, newspapers and others who have Web sites the blind cannot use. They chose Target because of its popularity and because of a large number of complaints by blind patrons.'

Considering how much accessibility and standards support is available in modern web browsers (well, except for that one we all know), and a rising probability of legal exposure for sites not meeting these needs, is there really any excuse for online retailers and others to not make their websites accessible to all?"