When search engines were born, there was a search engine results page that almost completely mimics what we see today: a URL, a description (perhaps), and a link for related sites.
Not much has changed within 10 or so years. We still see a search result, a description, and perhaps a link to similar pages, among other options.
For the most part, things have remained the same. But Dr. Pete shows that the SERP is changing, most notably with direct access to Onebox -- without SERPs at all. This behavior can be acknowledged with the iPhone and with Mozilla's Ubiquity.
Is this the end of the favored SERP, then? Not so much. Dr. Pete suggests that you don't ignore the opportunities to adapt (and preferably early) so that you can take advantage of these opportunities.
While this isn't an entirely new phenomenon, it's important to realize the correlation of this to personalized search: that the "10 blue links" may be replaced with multimedia, maps, and more. Blended search is becoming increasingly more mainstream, so it's not something to overlook.
Forum discussion continues at Sphinn.