I came across an article today on A List Apart written by Joe Clark: Big, Stark & Chunky (it is 18 months old - I know, I should read ALA more often) which was aimed at promoting the use of 'zoom layouts', which are those designed for people with low or impaired vision.
I certainly think that these alternative low vision styles have become more prevalent in recent times but was a little disappointed to find the comments for the ALA article, which were supposed to contain more examples, seem to have gone missing.
And the link provided to the ZoomLayouts page on CSS-Discuss doesn't actually have any examples. :?
So I thought I'd start my own list and add to it over time. Feel free to suggest your own links in the comments.