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I am 99.999% sure this is a new user interface for Yahoo Search. In the past, Yahoo never ever indented search results. In fact, in the past I thought they did do indenting and then stopped, but Yahoo told me that they have "never grouped results."
Many search results, including a search for search engine roundtable return grouped results now. Here is a picture:
This is 99.999% new behavior from Yahoo Search.
Forum discussion at WebmasterWorld.
Comments:
Ryan Grove
08/19/2008 05:05 pm
This was launched in early June. So it's new, but not <i>new</i> new. :)
Barry Schwartz
08/19/2008 05:08 pm
Do you have a link Ryan?
Ryan Grove
08/19/2008 05:26 pm
As far as I know there wasn't a blog post or press release announcing the change. Feel free to email me if you need confirmation that I work on Yahoo! Search: first initial followed by last name @yahoo-inc.com
Barry Schwartz
08/19/2008 05:27 pm
Why didn't you tell me?! :)