A lot of our members make bullet points, or navigation pointers just to make the navigation look a bit more aesthetic from a plain blue link, try adding a very small graphics in front of your links.
I agree with lisa, in your sites case navigation is better on your left, I like actually like your ads positioned on the banner but the rest its just to overwhelming and the visitor will just leave before they reach your useful content!
As for your articles or posts there actually hosted externally, whether its yours site or not I would still say its a bad move as they are leaving your site to go to someone else or another which may confuse your visitor.
Overall you have a good site concept some good content, and design ideas just need to put it all together now!