Update : I had to disable the plugin because it causes my Safari browser on the iPhone to crash. I´m not quite sure who to blame – the browser or the plugin, but I´ll try to find out soon.
WordPress and I are never going to be close friends but PageView got us a bit closer. With the help of this little plugin you can easily embedded websites into your post or pages without any pain in the ass. WordPress doesn´t allow direct iframe integration so this might help solve your problem.
You can customize the look & feel of the embedded website by changing the “pageview.css” file within the PageView plugin directory.
Get the plugin there : http://urbangiraffe.com/plugins/pageview/
Usage is :
['pageview url "some title" description']
(would look like this, if the plugin would have been enabled)