bit of a newcomer to web building, and having now finished a site which is xhtml transitional validated (except for the <embed> on the first page for the embedded .rm file... which from what i've seen around the net, is insurmountable).
But I have a couple of questions which are baffling me. Here is a link to the home page:
Your first question - you have to remove the xml declaration from the top of your page. It throws IE into quirks mode - you need to have the DTD at the very top of your page for IE to run in what it sees as being standards mode.