Hi Dustie,
I actually publish the SSWT Newsletter in RSS format, as well as plain text emails. I use Aweber, which I understand is similar to GetResponse - it allows me to publish any emails to an RSS feed by checking a box within my account. Here is the link to the SSWT feed, if you'd like to check it out:
http://www.aweber.com/z/rss/?sswt
Obviously that page will take you to raw code, you would want to add that feed to your Feed Reader to view it properly.
On the flip side, I also turn my RSS Feeds into Email Newsletters using Aweber's Feed Broadcaster option. You can see the subscribe form on my blog at
www.clicknewz.com - it takes my posts and turns them into a newsletter, and then sends it out at regular intervals (all automated).
The great thing about having a feed is that you can then pull that into web pages, or allow other people to do so, which means you can "syndicate your content" across the web on various related websites. It makes it all very easy and automated.