Here are a few simple CSS rules to "reset" various browsers' settings to a common baseline.  I've adapted this from what I spotted on Kyle Neath's blog here: http://warpspire.com/posts/css-frameworks/, who did a nice job at concise definitions (compared with what I've seen from the YUI toolkit and elsewhere).

* { padding:0; margin:0; }

h1, h2, h3, h4, h5, h6, p, pre, blockquote, label, ul, ol, dl, fieldset, address { margin:1em 0; }

li, dd { margin-left:5%; }

fieldset { padding: .5em; }

select option{ padding:0 5px; }

.hide { display:none; }

.left { float:left; }

.right { float:right; }

.clear { clear:both; height:1px; font-size:1px; line-height:1px; }

a img { border:none; }