Is simple CMS and pretty good one is
http://www.cmsmadesimple.org/ but if you like to compare the different cms which are around, this little application will show you all the differences and advantages of each cms:
http://www.cmsmadesimple.org/ and if you like to test some of the cms just to see how they are working and to get a view of the admin area,
http://www.opensourcecms.com/index.p...sk=view&id=452 is the page to look at