Hi Iuri,
A lot has been done in OpenACS and .LRN regarding accessibility, which implied improvements in usability too.
There's documentation at the wiki under the category "Accessibility":
- https://openacs.org/xowiki/Accessibility
- https://openacs.org/xowiki/dotlrn-zen-standards
- https://openacs.org/xowiki/ajax-accessibility
- https://openacs.org/xowiki/wcag_checkpoints
and a list of the improvements in .LRN 2.4 can be found at:
- https://openacs.org/xowiki/%2eLRN_2%2e4
- https://openacs.org/xowiki/%2eLRN_2%2e4_Release_Notes
A tutorial is also scheduled for the conference in Valencia (see the program: http://aulavirtual.uv.es/ficheros/view/agendax18x19.htm)
