No, not the PE that you're thinking right now!

PE stands for "progressive enhancement." It also includes graceful degradation. The mentioned techniques complement the utilization of advanced technologies such as Ajax, JavaScript, and Flash. However, they are also applicable to basics.

So why is PE fit for SEO?

Stephan Spencer writes:

Well, simply put, search engines are rather limited in their abilities. Sure, they may have patents to their names, highly complex algorithms directing them, supported by multimillion-dollar data centers and the most advanced computing technology, all backed by Ph.D.s in various flavors and more engineers than us average folk could ever imagine, but their spiders are pretty much limited to following simple HTML links from page to page.

Without progressive enhancement, many sites add lots of great interactive functionality at the expense of cutting search engines off from the rich content on the pages. Maybe the best way to really understand this is through a live example.

Why don't you try it too?