Great site, content is everything, minimal site graphics is the correct decision.
The only thing I would like to see (or make more of) is an "about us" or "about our services" page to explain what you offer better.
The one thing I noticed is that the "choose a feed now button" is cut in half in a 800x600 screen res. and you have to scroll to the right to see what it says. Since getting people to sign up is what you are trying to accomplish you might want to position the button on the lefthand side of the page.
Interesting and helpful site. A few places to improve:
1) The navigation in the top right corner need to be made a bit bigger and it would be improved if the colour of these links was also changed so it contrasted with the header a bit more.
2) If I were you, I would move the "choose a feed right now" to the top of the left column and put the text and instructions (or most of it) under the button.
Generally though, a great site. Your markup is nice and clean too
Very nice one overall and I really like your logo. Interesting and very helpful site. There are not much graphics in there making it faster to load and very easy to navigate. However "choose a feed now button" is cut in half in a 800x600 screen res. So work on this.
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you can make the header just a little bit bigger but the way it is nice to 
