[netranrate]

These are the main steps you should consider while designing search engine friendly site..

Using Well Formed, W3C Validated HTML Code
avoiding maximum use of Flash Technology, JavaScript & Frames
Proper use of URLs
Website and Directory Structure
Limiting the size of your web pages
Proper use of Robots.txt file

[johnnyblame]

I think that helps the most since the nature if idx websites is that they are dynamic is that you have seo friendly urls, good 404 fall back with redirection and a good dynamic sitemap to go hand in hand with your listings

[kellierhymes]

Nice information thank you for this.

[homes for sale anchorage]

To make the website more SEO friendly it must have relevant content, competitive keywords and less flash.