In my eyes the most uptodate version is Cadsoft EAGLE, which you can find here:
http://www.cadsoftusa.com/eagle-pcb-design-software/product-overview/
The new version v6 is updatet regularly.
i would recommend http://www.cadsoftusa.com/.
It is the best software for circuit board design i think.
It includes a schematic editor, autorouter and a layout editor.
For more info just check the homepage.
greetings