I learned this the hard way, a few weeks ago i had about 1400 indexed pages, it was always a bit odd because i knew i was blogging alot but not that much, so i started going through my serps for blueverse and i saw a ton of search queries, tags and categories within the serps with no unique description in the results, this is a really really bad thing to have in your serps if you are targeting for some tough keyword, since i was using All in one seo pack for wordpress i easily no followed all search queries, tags and categories.
This gave me a really good boost within the serps which is resulting in me ranking as follows:
A search within a search, who would’ve thought google would give out its primary funtion to another site’s benefit, this just goes to show how much google loves wikipedia (and a few others) because of its authorititative content, the new search box for wikipedia helps people to search within wikipedia’s site (i’m guessing all the indexe pages at google), it is an effort on google’s end but it seems like reaching a bit too much and pushing people to use wikipedia more besides the fact that most webmasters are complainging that wikipedia ranks higher then they do on keywords that they specialise in, at least this feature came out of google beta then those weird search index options feature..