Best way of dynamically scaling a page?

I was wondering what you guys and gals would recommend as the most efficient want to dynamically rescale a website based on resolution?

Is there anything that rescales elements AND images? Or do I need to do those separately? I've been trying to use percentages and em's, but it seems like a huge hassle. Are there any scripts? I've been searching for quite a while and haven't found anything that quite fits yet.

New Media Queries are landed in CSS3 specification. You can read an awesome article on the subject from A List Apart Magazine (with example, try resizing your browser window)

There are also existing scripts of course.