One thing I see is in this post, Austin Economic Indicators, at the bottom below the table of images is this:
<p style="text-align:center;">
<p style="text-align:center;"><a href="http://www.austin-chamber.org/DoBusiness/MediaCenter/reports/EconomicIndicatorsSlides.pdf"><br />
</a></p>
<p style="text-align:center;">
<p style="text-align:center;">
<p style="text-align:center;">
<p style="text-align:center;">
<p style="text-align:center;">
<p style="text-align:center;">
<p style="text-align:center;"> </p>
See the break after the PDF link? It should not be within the hyperlink code, and there is no text to function as a link.
Notice all the <p style="text-align:center;"> with no closing tags? Get rid of all of those.
It should look something like this when you are finished:
<p style="text-align:center;"><a href="http://www.austin-chamber.org/DoBusiness/MediaCenter/reports/EconomicIndicatorsSlides.pdf">Economic Indicators Slides</a></p>
You need to go through all your posts in the HTML tab and see if there are other such instances.
You also need to do something with that table that is hidden below the sidebar. What good is having it in there if people cannot read what is hidden?
One thing you can do is set your blog to show only one post per page (settings > reading) and then go through all the posts in IE using the previous post link at the bottom of the page to see which posts break the blog.