Here are some of the things you might assess:
- Using Analytics (Presuming you have it installed), look at the average time visitors are spending on your website. I have seen websites that rank in the first five places in Google for highly searched keywords not return a single inquiry simply because the color of the website projected the wrong image. A simple color change increased conversion.
- Does the website get the message to visitors quickly. Remember you have about 6 seconds to convince a new visitor that your website is worth their time. If it is a flash site, that 6 seconds may be just a load status bar.
- Is it easy for people to contact you? Remember, there are many distractions online that can take away somebody who is ready to take action – someone may IM them, or an email they have been waiting for may arrive and they are distracted, then never come back to your website. I have seen a simple change on a website increase the conversion rate by 400%. That change was just putting a simple contact form on the top of the right hand column of every page.