Click on the top iPad border to rotate.

Remember that Flash is not going to work on iPad, even though you might see it working here.

You can preload a page or set portrait mode by passing using URL parameters, like this: http://ipadpeek.com/?url=google.com&portrait

Reload button on the iPad address bar works.

Pages in portrait mode are scaled to 75% using CSS3 transformations, which work best in Firefox 3.5+, Chromium 5+ and Opera 10.5+ at the moment.