Layouting pages with ADF Faces containers is sometimes not as simple as we would have liked it to be - especially for people who are just getting started. There are some tricks that can help you achieve the layout that you are looking for.

One great way to learn some of those tricks is to look at the new
"Visual Design" section of the ADF Faces Hosted demo.
For example look at the Form Layout part - and you'll see nicely aligned forms that contain various UI layout scenarios. Want to learn how this has been achieved? - just click the "page source" link at the top right - and you can see how that layout has been done.
Don't forget that you can also download the full demo source here.

One other good resource I came across today is the "Designing well known websites with ADF Rich Faces" presentation from Maiko Rocha and George Magessy - it's missing the demo part - but you can still learn a lot from the slides.