good links on css

http://csscreator.com/attributes/containedfloat.php
http://www.positioniseverything.net/easyclearing.html
http://www.w3.org/TR/CSS21/visudet.html#root-height
http://www.shauninman.com/archive/2004/07/23/absolutely_positive
http://tjkdesign.com/articles/clearing-floats_and_block-formatting_context.asp
http://csscreator.com/node/17164

http://css-discuss.incutio.com/wiki/Clearing_Space