By far the best way to boost your eBay listing n the ebay search results is to obtain Top Rated Seller status (or what ever they're calling it these days). This will put you above sellers who are not top rated amonst other benefits.
The best way to boost your eBay listing and shop exposure otherwise is to employ standard SEO methods.
This will improve your SERP rankings for google etc. and can sometimes lead to your item being displayed on google's shopping page.
If your not already using HTML in your listing then I would highly suggest it, it makes for easier SEO and can give you the edge with a professional look.
If your not familiar with SEO methods google 'seo for ebay' an there are a few good examples.