Hi - I've used PageLines, as John noted below, also Modern Multipurpose I like - and the one I use for my main website (not an affiliate one though) is Boldly. All of these are, or have free versions (I've not used the paid versions for any of my sites - but paid versions of PageLines for example, do add more functionality if you're looknig for it).

Barb's a seasoned blogger - so I would always trust her advice - your theme needs to be one you are comfortable with, but also has to serve the needs of your visitors. Visit the site, find what you're looking for, read it, perhaps click through to the affiliate website. If they are put off by your colour scheme, or fonts, or too much text, or not enough information, they will just bounce to another site.

All the best, Mark

Attractive and easy to read are the two keys. Don't make it too wild or busy or gimmicky. People want to be able to quickly find information and read it, so make those two things as easy as possible with whatever theme you choose.

Kyle made a statement in one of his course lessons about that. He said: "Keep it simple" and he mentioned the crappy look of Craig's list. Kyle himself uses a simple Theme "Pageline and/or Platform".

Another way to is to do some simple searches on google and just look at websites. There is a tool that let's you find out what theme it is, IF it is a Wordpress theme. Try this link:

http://whatwpthemeisthat.com/

Hope that helps