SERP Preview Tool
This simple tool gives you an idea of how your page might be represented in search results (SERPs). Note that the snippet of text underneath the listing will not necessarily be your meta description - this depends on a number of factors. Some engines (e.g. Google) can also use titles and descriptions from other sources (like the Open Directory).
The preview might help evaluate factors that could improve the clickthrough rate of your listing, by presenting attractive text to visitors.