Fantastic site there
SEF does make your site much better, If you read the instructions, it informs you on exactly what to do with .htaccess.
Just a recommendation in your css to stop your headings laying across each other
In template_css.css change
h1, h2, h3, h4, h5 {
margin:15px 0pt;
padding-bottom:5px;
}
t0
h1, h2, h3, h4, h5 {
line-height:normal;
margin:15px 0pt;
padding-bottom:5px;
}