Colorado Parks and Wildlife has a great (and free) online guide to elk hunting. You can find it here: http://wildlife.state.co.us/Hunting/...niversity.aspx
I also liked the new "university of elk hunting" dvd available on the elk101 site: http://www.elk101store.com/servlet/t...DVD/Categories
I think this article on rokslide is a great summary for early season hunts: http://www.rokslide.com/2012-01-09-0...on-elk-tactics The rokslide site has a great blog and forum as well.
Best of luck!