WSS 3.0 style modifications
Edit Page -> Create a custom content webpart
Now you can apply CSS styles to override Microsoft's... (BE CAREFUL, you can break the page layout and would need ...default.aspx?contents=1 to close or delete your Custom webpart)
table {margin: 0 20px}
.ms-vh { display
http://www.heathersolomon.com/content/sp03cssreference.htm