Domerama.com - This is one of the greatest resources I have found for all things dome! Take a look around and you will be motivated to start your own!
BuildItSolar: Solar energy projects for Do It Yourselfers to save money and reduce pollution - This is the premier site for all things harnessing the sun.
Desert Domes - The 3v Dome Calculator - This is the site I used to make my early sketches into a real plan! I can't thank them enough for their calculation tools and inspiration.
Dome calculation tools - another great resource for calculating measurements and supplies.
NDSU Building Plans - Just about any agricultural building project you can think of, from North Dakota State University. Great for generating ideas and winter reading!
National Sustainable Agriculture Information Service - I linked to the solar greenhouse page, but this site is huge! What a fantastic resource.