Yeah I know, yet another "What is favorite 'fill-in-the-blank'" question, but I think the Queen of Soul deserves a what is your favorite posting. My favorite is Chain of Fools, followed closely by Think. I really like how Think was done in the Blues Brothers movie. It was when I first found out who sang that song. So those are my two, what are yours.
God, all her songs are so overplayed these days. Especially thanks to wannabes murdering them on American Idol. I can barely listen to any of her '60s stuff anymore. A really great song of hers from the '70s that's not overplayed is "Rock Steady". I also like her cover of Elton John's "Border Song".
I love all the suggestions so far - natch - but maybe my favorite is "Good to Me as I Am to You." "Ain't No Way" is another fabulous song. She actually has one disco-y song that I really like, too - "Another Night." Hey, what can I say? Aretha transcends the genre!