Jon Udell has a interesting piece on MSN Virtual Earth, Google Maps, and AJAX deep linking. Jon talks about Microsoft's Virtual Earth and google's maps and how they support deep linking in slightly different ways. The bookmark example of the upcoming LiveGrid release follows more closely with google's approach.
Jon also pushes for having an AJAX savvy URL-line:
Before we abandon the notion of an AJAX-savvy URL-line, perhaps we should take another look at what it would take to leverage the existing convention and adapt it to these new circumstances.
Interesting idea. Not sure what an AJAX-savvy URL-line will look like yet, but it will have to overcome the current usability issues with using the current URL-line for AJAX linking. Perhaps, we need a separate Deep Link URL for the browsers. Or, perhaps we need a list of published URLs to represent permalinks within a given page. This might help support having multiple contexts within a page.
The best answer doesn't seem clear yet. It does appear that AJAX is moving forward and pushing the limitations of the current browser technology. Hmmm... Simple ideas pushing the limitations of our current software through an evolution that is driven by user value. Seems like the way it should be.