How to plan accessible websites?

These links will lead you to accessibility:
http://www.tieke.fi/tuotteet_ja_palvelut/esteettomyys/
http://www.nkl.fi/tietoa/esteettomyys/index.htm
http://www.avence.fi/index.php?id=2

Plain language and the internet:
http://www.papunet.net/yleis/julkaisut/raportit/?id=561

An example of a sign language website:
http://www.oikeusasiamies.fi/Resource.phx/eoa/index.htx

An example of an accessible web service:
http://www.ateneum.fi/default.asp?docId=12023 (See, hear, imagine: Hugo Simberg's online exhibition for the visually impaired)
http://www.fng.fi/fng/html4/fi/ateneum/children/children.htm (Sign language videos of the Ateneum for Children)

More information on the subject is available in Tieke's accessibility guide, Essi courses (project for accessible content production) or the accessibility project of the Web Accessibility Initiative W3C consortium.
http://arkisto.tieke.fi/esteettomyysopas/estohje.html
http://appro.mit.jyu.fi/essikurssi/testaus/t2/
http://www.w3.org/WAI/

The Ministry of Transport and Communications Finland has launched a programme whose aim is to promote accessible communications.
http://www.lvm.fi/scripts/cgiip.exe/WService=lvm/cm/pub/showdoc.p?docid=2462. The programme is available in plain language and sign language via the same link.