I fixed a couple line althought i dont think that it was the cause of all that. I did a few test a my side. By increasing my Right Sidebar of 20 px and increasing my template width of 20 px i fixed most of it, my site overall has 20 more pixels but sure i can live with that. Only the Home page is still having that problem because:
1- The Rokslide module is not showing properly ( Tabs are in seperate lines )
2- My User 1 and User 2 Modules are taking 100% of the space while they should probably need to take 90-95% so my right module do not offset.
By exploring the CSS files i noticed you had a ie6 template, reading the first line made me laugh. "IE6 is a hunk of crap!!! " Haha!
So if you guys could light me up on those 2 points i can probably get over it.