Whether you are a web designer, or just want to test a given web page (your OPAC, for instance?) for accessibility, WebAnywhere is a great web-based resource.
What it is, simply put, is a screen reader that works within your browser without requiring a plug-in or specialty software. Just enter the url of the website you wish to have read, and it simply works.
This is a great way to enable all your library computers to be a bit more accessible, without having to install anything; as well as providing a resource for those with visual limitations.
found via MetaFilter