Crate & Barrel and Macy's both have registry apps, they're for sure available on the iPhone (got them on mine)- not sure about Android.
The Crate & Barrel one actually allows you to scan items through your phone and onto your registry, tried it out yesterday and it worked great :-) Both apps make it really easy to update items and stuff.
<a href="http://www.thenest.com/?utm_source=ticker&utm_medium=HTML&utm_campaign=tickers" title="Money Saving Tips"><img src="http://global.thenest.com/tickers/tt17ce82.aspx" alt="Anniversary" border="0" /></a>
Planning Bio-Added FOR SALE page, will be adding more stuff to it soon!