Here are some links to help you along making your tables accessible and look pretty too!
- Explains the use of things like scope, abbr and a good format. (Presented in 2005 but it is not outdated yet.) http://www.usability.com.au/resources/tables.cfm
- The author at http://aenui.com reminds us that tables still easily look nice. http://aenui.com/user-interface/designing-tables-for-usability/