See www.CoolLogistics.net for CMS site with lots of detailed pages on speakers, sponsor logos etc. - all done by the clients staff.
www.Linden-House.org is a straightforward CMS site.
See www.KidsKidneyResearch.org for a very happy client's website. One tiny thing they love - they can easily put up thank yous for small donations. Imagine how negatively cost effective this would be if you had to pay a webdesigner each time!