On Friday I wrote a piece on how it looked like Google was testing AJAX results in the main serps. Some discussion followed as to whether, if this change were to become a widespread permanent one, this would affect Firefox plugins that existed (definitely some existing ones would stop working), break some of the rank checking tools out there (they would have to be re-written I’m sure), and even some people asking if it would thwart serps scrapers from using serps for auto page generation (not for long, no).
While those things would definitely be affected in at least the short term, there is a much greater impact from Google switching to AJAX. All of the issues mentioned involve a very small subset of the webmastering community. What actually breaks if Google makes this switchover, and is in fact broken during any testing they are doing, is much more widespread. Every single