My friend Dane Ciolino teaches Ethics at Loyola Law School in New Orleans, and specializes in legal ethics issues. He wrote the book on Louisiana Legal Ethics, and how he has put the book online in the form of a website called Louisiana Legal Ethics. It's free, and will be updated immediately whenever changes warrant it.
The website is optimized for mobile phones (including, of course, the iPhone) so the information is usable pretty much from anywhere you have an internet connection. The site has an RSS feed, and an email newsletter option. And Dane has set up a Twitter feed if you want the updates delivered in the most timely fashion possible.
This site will be the go to site for Legal Ethics in Louisiana so if you're a Louisiana lawyer check it out, and bookmark it.