I love the curbcut effect. (Might have the name wrong). The idea is that when you improve accessibility for one group, it tends to help everyone. So you put those cuts into the curb for wheelchair and it also helps people moving packages with trolleys, and with strollers, etc.
New example I've found. Webcomics that put the script under the comic for people with screenreaders and such. SUDDENLY I CAN ACTUALLY FIND OLD COMICS WITH GOOGLE WHEN I WANT TO SHOW PEOPLE A SPECIFIC JOKE.