Google has removed the ‘Supplemental Result’ label shown in the search results and disabled the search operators that could be used to list them (see their official blog).

Many of the comments on the official blog post post lament the loss of this label as it was a useful way to easily see the pages that Google thought were less important. The post says that Google is working to integrate supplemental results with the normal index so ‘The distinction between the main and the supplemental index is therefore continuing to narrow’.

I can see why people are getting het up about it, but when it comes down to it webmasters just have to continue to try to doing their job well - creating pages full of new, unique content. That’s how you get pages into Google’s index.

Anyway, it makes the supplemental pages bookmarklet I created redundant.