If you want an actual review of your site, you'd probably get more responses by posting a request in the forum site review section.
Conversion optimization is a complex topic. It's simple on the surface, but tricky to implement. It depends on having a good product to start with, and a strong offer. You need prominent calls to action, compelling copy and a user-friendly site architecture and navigation.
But in the end, there are no hard-and-fast rules. What works great for one site, with one product, targeting one audience will fail miserably for another site, another product and another audience.
In general terms, there are a number of oneline resources that can help you improve your conversion rate. For instance, check some of the research at MarketingExperiments.com
and some of the free articles at FutureNow's GrokDotCom blog
You will also want to check in to testing tools such as CrazyEgg and Google Content Experiments (available under the "Content" tab in Google Analytics). Many times, the only way to determine which content optimization tactics are working for YOUR site and YOUR audience is to test them. (And often times it turns out the option you thought would NEVER work, the one you put in there almost as a joke, turns out to be the best-performing. It always
pays to test.)
Hope this helps!