Web Accessibility Resources
The World Wide Web Consortium (W3C) is an international organisation working to develop international standards, protocols and guidelines to ensure interoperability and compatibility. Available on the W3C site are validation tools to assist you to ensure compatibility with current standards, such as xhtml 1.0 transitional.
The home page for the W3C's Web Accessibility Initiative, providing information, tools, advice and many resources.
The RNIB have a Web Access Centre on their website, which provides information, advice and resources on creating accessible websites. The RNIB also offer an accessibility audit service for your site, following which you can arrange to display the RNIB "See it right" logo on your site.
The Disability Rights Commission is an independent body whose aim is to prevent discrimination and promote equality of opportunity for people with disabilities.
The Guild of Accessible Website Designers is a worldwide association of organisations, web designers and developers, with the aim of promoting and protecting the of standards of accessible design.
The Web Standards Project (WASP) has the following mission: "Founded in 1998, The Web Standards Project (WaSP) fights for standards that reduce the cost and complexity of development while increasing the accessibility and long-term viability of any site published on the Web".
Online Utilities & Services:
At Vischeck, there is a free service, which will render your website to an approximation of how it would look to people with one of a number of types of colour-blindness.
Webxact is a free online service that will test your web pages for quality, accessibility and privacy issues. Watchfire are a software company that provide the widely known and used Bobby software, which test for accessibility issues against the W3C Web Accessibility Initiative Guidelines 1.0, and also the US section 508 regulations.
The HiSoftware Cynthia Says portal is a free online testing service that checks your webpage for compliance to the W3C Web Accessibility Initiative Guidelines 1.0, and also the US section 508 regulations.
The W3C have run a number of useful online validation services, including html, css and a feed validator (to check functionality of RSS and other feeds). The link above will take you to a page where you can choose from all that are available.
Online News and Magazines:
A List Apart is an online magazine for website designers, with a special focus on techniques and the benefits of designing with web standards.
The Register. For IT and business news, software, and many other IT related things. Be sure to checkout the BOFH archives and squeeze some highly entertaining recreation time into your site visit.