They say it's not a bug, it's by design here, even though Google's support page says it accepts Safari 4 as a fully supported browser.
If you want Google searches to go back to the modern style, you need to change your User-Agent string.
It's inevitable that older software becomes obsolete, the same way older hardware does.
Phrases like 'Call my wife' or 'Tell my dad' stopped working.
Siri knew who those people were but proclaimed 'Uh oh, I don't have a phone number for Jane Isa Doe." and beneath, there's a message: "Content Not Available." I debugged this for over an hour and on a hunch, found a workaround that seems to work for nearly everyone who has tried it.
I'd be curious to know from Mac OSXHints users whether they are experiencing this problem in the first place and if the workaround works for you, too.
I'd also like to understand why this works and why the problem even exists.