[nostrademons]

Or was called SearchWiki. It turned out that nobody liked or used it, so it was removed.

[gojomo]

I liked the small satisfaction I got from 'X'-ing out spammy sites!

[_delirium]

I would've used that more if X-ing them out kept them out! Afaict, it only removed them from that particular search, and if you searched again, they'd show up again.

[code_duck]

I believe it only had an effect on your personal view of Google. Otherwise, it would have been abused by competitors and 'SEO experts'.