Some sites that don't have AAAA DNS today:

www.apple.com

www.amazon.com

www.sony.com

www.oracle.com

www.ibm.com

www.intel.com

www.adobe.com

www.ebay.com

www.dell.com

www.hp.com

www.nasa.gov

www.hotmail.com

www.wikipedia.org

news.ycombinator.com