I'm at work so I cannot help much right now but one thing that stands out right from the top is that "Categories" is not inside the "'sidebar'" div where as "'Blogroll'" is. I don't know if this is the error or not but it looks like a place to start to me.
Also, Thor is right, your site looks fine in FF but has this error in IE.
Hope this helps...
JHalstead added 46 Minutes and 56 Seconds later...
Solution to follow, I think 
(This change is without any guarantee, it might actually break your HTML structure, so check your structure after making this change)
In your template you have:
HTML Code:
<li><a href="http://www.zer0-gravity.com" title="Where The Best Come To Play">Zer0-Gravity</a></li>
</ul>
</li>
</div>
You need to move the UL, LI, and DIV to:
right before
HTML Code:
</ul>
</li>
</div>
<li id="ajax-calendar-1" class="widget "><div id="giraffe_calendar">
I saved a local copy of the HTML and made this change to test, this should work for you. Let me know...
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