1) Some definitions
http://css.maxdesign.com.au/floatutorial/definitions.htm
2) Float basics
http://css.maxdesign.com.au/floatutorial/introduction.htm
3) Position is Everything
http://www.positioniseverything.net/
4) IE6 Peekaboo Bug
http://www.positioniseverything.net/explorer/peekaboo.html
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Jazakallah, Rakib vi superb links.It helps me a lot.
May Allah bless you.
Ahsan Murshed