Theme development

I really like the overall structure of this pages layout:
http://codeigniter.com/wiki/

Particularly, how the content area is centered... I would prefer to float the column on the right side.. minor.

Is there any drupal themes that I might find friendly to this design style?

I am presently using a slightly modified version of the zen theme and would like to improve upon the look of my site.
( www.pacificallsurf.com )

After creating a story/page and clicking submit i receive a blank page? for example, i created a story and clicked submit and i am directed to this url: http://.....com/?q=node/2/add/story where i see a blank page

I am working on a custom drupal theme from scratch, I have built my:
page.tpl.php
node.tpl.php
template.php

Hey Everyone,

I have a problem with my website.
In IE it's all working fine, but in Firefox it is really a mess. So mebye i have made a mistake in my CSS.
I hope anyone can help?

Thanks,
Tim

A piece of my CSS --

/* Generic elements */

body {
background:#444444;
margin:0;
padding:0;
font: 12px/170% Verdana;
color: #333333;
}

body.mceContentBody {
background: #FFFFFF;
}

a:link, a:visited, a.hover, a.active, {
color: #333333;
text-decoration: none;
}

#container-full {
width: 794px;
margin-left: auto;
margin-right: auto;
background:#FFFFFF;
}

#header-full {
margin-top: 0px;
}

#header {
/* de header zelf GEEN DATA */
}

#primary-links, {
font-weight:bold;
font-size:10px;
position:absolute;
margin-top: 172px;
margin-left: 50px;
}

ul.primary-links li a, ul.primary-links li a:link, ul.primary-links li a:visited, ul.primary-links li a:hover, ul.primary-links li a.active {
color: #FFFFFF;
}

#secondary-links, {
font-weight:bold;
font-size:11px;
text-align:center;
}

#frontpage-top-left {
width: 342px;
text-align:left;
float:left;
background-color:#e8e8e8;
margin-left: 29px;
padding: 0px;
}

#frontpage-top-right {
width: 346px;
text-align:left;
margin-left:25px;
float:left;
background-color:#e8e8e8;
}

#text-block {
padding-left:0px;
padding-right:0px;
}

I'm looking to set one of my primary nav items to only show when a person is either unauthenticated or authenticated. How would I go about doing this? My purpose is to have a nav item that says Login, and then change that to Logout when the person logs in.

Hello!

Ive got a Problem with my Drupal Project. I modified the Zen Theme. This is the URL:
http://www.foundation-crew.com/user

The standard size in 'body' defines 11px ...

body {
font:11px
helvetica,verdana,arial,clean,sans-serif;
*font-size:small;
*font:x-small;
}

I stick to the way of handling Font Sizes via percentage - e.g.:

font-size: 140%;

The URL: http://seagull.eu/projectdrupal/?q=node/1

The blue background is supposed to be the footer background. As you can see, it also overlaps the content.
I've tried everything, but it won't go away... I only changed the CSS of the theme (altered the marvin theme). So I did not mess up any PHP pages.
This issue only appears when browsing with Internet Explorer 7. (In Mozilla Firefox everything looks fine).

Please help, I'm desperate :)