So i have x amount of "blocks" that I want to float left.. Like this :
A B C D
E F G H
BUT, if B is twice as long as the rest, for example, there would be white space between A & E, C & G, D & H.
How can I avoid that and just have all the containers float to the left and then fit in nicely without excess white space in between ?
CSS cannot handle this in the general case.
If there are a fixed number of columns, you can cheat and do this: http://jsfiddle.net/suaaK/11/
Otherwise:
See this answer for a comparison of the candidate techniques, showing that they don't work:
If you're willing to use JavaScript, you should use jQuery Masonry.
Demos:
Set up your CSS into vertical columns versus horizontals. Smashing Magazine has a great piece about floats and their quirks, go take a look: http://coding.smashingmagazine.com/2007/05/01/css-float-theory-things-you-should-know/