i've been following the step by step layout tutorial and i am not having any success with my content boxes.

here is what my myspace layout looks like so far. of course it's no where near what i want it to look like.
this is my my photoshop work of what i would want it to somewhat look like.
this layout that someone else did, diamond DIV, i would like for it to somewhat look like this: simple but clean.

how can i get the content boxes to where i want it to be? how can i get the boxes to not have sharp edges but hip with a little soft round edges or something like that?

thanks a bunch!!