I gave up on using CSS for form styling when I hit snags like requiring 3 textboxes adjacent to one another (like a phone number) or a dropdown list next to a textbox. I just couldn't come up with a reliable way to style it without good ol' TABLES.
I'm thinking about going back to CSS for form styling; I don't know:
References? Is this still a pipe dream?
There are a couple of CSS templates designed specifically for laying out forms.
I hope this helps point you in a productive and awesome direction. Take care.