I have been playing with Google Sitemaps recently. Not sure if it will increase the ol SEO results but hey there is no feeling like pleasing google ehh 🙂
I found a very nice application for spidering your site and then creating a sitemap that you can upload to Google.
It’s called Softplus Gsitecrawler and makes the whole process a Breeze.
Google provide some links for applications and also a script that you can install server side that will automatically create a sitemap for you, but I prefered the sitecrawler. It also tells you if you have any dodgy pages or links too.