How'd Google Do That?

I've never seen this before..

[Easy_Coder]

so I thought I'd ask...

What does it indicate when the google results are grouped and seperated by the horizontal blue line? Is this new? I'm seeing results like this pattern:

result 1
result 2
result 3
----- horizontal blue line -----
result 1
result 2
result 3
----- horizontal blue line -----
result 1
result 2
result 3

Too, when I try to view the source on one of these pages here's what I get:
Rank_1:1:7

What's that all about? My search was for gut punch.

[SFReader]

After the first blue line, does it say something like: results for "some similar but different keyword"

If so, I have been seeing it for a while, and it has never been of use.

[robzilla]

I got the same thing searching for [concur]. After the first line, Google gives results for [dictionary]. Odd. Perhaps they assume that most people looking for [concur] are looking for its definition.

[pmkpmk]

I can confirm this, but only for google.com. Google.de shows it without lines. Google is known to make randon A/B tests with new features, but me being able to reproduce lowers the chance that it is just a test.

[jimbeetle]

The "see results for" block in the middle of the page has been seen here and there for the past few months. Matt Cutts has the best explanation in one of his UI Fun posts [mattcutts.com].

[Leosghost]

A search for the term yahoo directory from France also shows this effect on the landing page ..shades of things to come for other terms?.

[caveman]

Yeah I saw it the other day for a couple of Branded terms. Oddly enough, the bracketed section in the middle contained links for one of G's competitors. I wasn't searching on the competitive product; I searched on a generic term that also happens to be a brand name for a product that the competitor puts out. :-)

[Stefan]

I've been seeing it for a few of our serps for over a month now on various vague searches (found via the query list in analyzers). It lists us well for very minor kw combinations (top of the middle third), so not a problem, but as a user I sure hope it doesn't spread - it's annoying, cluttered, and relatively pointless.

[Sobriquet]

yes this is happening adn it looks bad. one of my sites always appear on 4th or 5th position on my main keyword has lost its traffic because of this. after 3 positions, google starts showing a diff match

[Easy_Coder]

I don't see it for every search but when I do the results don't appear to be so hot...

After the first blue line, does it say something like: results for "some similar but different keyword"

yeah the different keyword is another form of my original query phrase