I am facing the same issue, with 2 sites but 2 others work.
One of the problem sites is
richmondpaving.net/. The problem is not on all PCs viewing with IE, but on my main PC I see the PDA version.
Site is Joomla 1.523, with Mobile Joomla! and Mobile - TeraWURFL 0.9.12.
User agent string:
Your user agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; SearchToolbar 1.2; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Of note,
www.mobilejoomla.com also appears as PDA version in this browser.
Any ideas or help is appreciated.