A quick primer on why you should pay attention to your web pages' meta description tags. For your key pages at least. Why? After all search engines don't give this information much attention when ranking...
University content strategists Meet Content provide a quick briefing which is worth a look if you manage content.
Basically, getting your meta description content right impacts on the usability of your placing in search results. Not much point coming top in a results page if the information you present doesn't incite users to click your link.
Assessing the Value of HTML Meta Tags - article by Rick Allen for MeetContent.com