Yahoo is testing a pretty unique version of their Yahoo Shopping Ads in their search results.  While the ad unit features the usual thumbnails and products, it also allows you to click through options to “shop by brand” and “shop by price.”

Here is another example with the option to “shop by category.”

And this one actually has a ton of options, including shop by dress style.

They don’t appear for many queries overall though, for the ones that do contain shopping ads in them.

However, the filtering definitely doesn’t work well at all.  For example, when I clicked the “One Shoulder” in the “Shop by Dress Style” only a single one of the results they presented was actually a one shoulder style dress:

So their filtering could definitely use some work.

These options are not very obvious either, so I suspect there aren’t very many who would use them.  Presented a different way, such as at the top or with check boxes, it could turn into a feature that is used.

But it is always nice to see Yahoo testing out new things in their ads, especially as product listing ads become more and more popular.