pvgool: "
The nice thing is that you can force Google to use the DMOZ description instead of any text on the site. "
Most SEO types are not interested in doing this. Some SEO's and Webmasters are more interested in producing a self-promotional hyped description that will product better click through than the factual non-promotional DMOZ description.
I am not sure you can force Google to us a DMOZ description. It has been reported on the SEO forums that Google appears to be more likely to use the DMOZ description when the pages Meta description is short. Personally I don't think there is any sure fire way out there that will cause Google to use the DMOZ description. And even if there was who would want to do that.
Why would I ever prefer DMOZ description of my site "Offering articles, internet based tools and optimization services. Aylmer, Ontario." over the one I have in my Meta description - "519-636-6636 - SEO Company provides Canada, US and UK clients with professional optimization and marketing services. We drive the market to your site."
While the DMOZ description shows when I do a allinurl:
www.seocompany.ca it doesn't show when you do a search for "SEO Company" and I am very thankful for that!
"
The only thing you need to know (and every SEO-person should know) is which part of your site will be indexed and used by Google and how Google will connect your site to certain keywords."
Not sure what your point is here?