mslina2002 - 2:25 am on Sep 28, 2012 (gmt 0)
If you put the NOODP meta tag in your header it Google will not use your DMOZ description in search results. See the "Prevent search engines from displaying DMOZ data in search results for your site" section on this page: [support.google.com...]
You mentioned "rich snippets" in your OP so microdata is one of the form of rich snippets. It's a way for you to format your content so it shows up with more information in serps - e.g. recipes, events, product reviews, etc.
The testing tool is here: [google.com...] where you can see if your page has been formatted correctly and to preview what you would be seeing in serps if you had your pages formatted with microdata, rich snippets, etc.