I can't figure out why my containers won't work side by side.

http://5150.ath.cx

If you'll look at my site the username and password will be below the main post area. I want it to be towards the top, below the banner; next to the blog section.

Any help is appreciated. Thank you!

For starters, I recommend that you fix the markup errors reported by our online validator.

I don't see any attempt to make the two div elements side by side. Perhaps one of the two-column layouts at one of these sites will help:
glish.com : CSS layout techniques
Max Design - Sample CSS Page Layouts
Skidoo : Ruthsarian Layouts
The Layout Reservoir - BlueRobot

Thanks for the links, i figured it out. I'm still new to this, so sorry if the css didn't resemble what i was trying to do.

I'll go through and fix those errors now.