cafedave.net linked to this interesting post, Three Things I Learned About Screen Reader Users on http://unraveled.com.

You should hop over there and read the whole thing, but here are my notes:

Make sure [access keys] don’t conflict with browser or screen reader shortcuts. Thankfully, the good folks at Web Accessibility Testing and Services have already started looking at this. Here’s their article on the topic.

Everyone...used JAWS, which doesn't read display:none; content. Thankfully, the good folks at the CSS Discuss Wiki have researched the issue and designed an improved method that works in 11 major browsers.

(Because of forms mode in JAWS), use the fieldset and legend elements as suggested by Derek Featherstone’s comment.