It makes sense though. Content is key on the web and search drives traffic and its because of indexed pages in the search engines that our sites become found when googlers (and other searchers) search for keywords. So why not create a system that tells the crawlers what to index. Well thats what Google sitemaps is. At first glance there is a lot to read but don't be afraid you don't need to read through much. If you know how xml files work you are one step ahead of the gang and if you don't, Google provides a very easy to understand walkthrough of the proper sitemap xml type protocol markup.
I literally created my sitemap in 5 mins after reading it. Mind you it only consists of 14 or so pages but you get the point, it's quick and painless. Lots of boring copying and pasting. If you have a very large site then you might want to set aside an afternoon for some repetative copy and pasting.
One thing that I found pretty cool is in the xml protocol there is a tag for priority. You can set this from 0 - 1. This just lets the crawlers know which pages you stress as the "important ones". If you haven't tested out Google sitemaps yet, go ahead and get adventurous and improve your chances of being found.