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If possible add unique content to your category pages, and use unique post extracts. Then no need to block.

Don't block "read more" as these link to full posts.

"the www version has more linking root domains, and for most of the keywords the www version shows up in Google"

In that case I would stick with www.

The worst, in my opinion, are the unethical ones.

Case in point, a web developer scored a job to create a website for a popular government owned (.gov) attraction. They added a, SEO Services page (TOTALLY irrelevant) to the site, and linked back to their site with it.

I don't believe anything like that currently exists.

Short answer: no.

Long answer requires more info.

• I can't see any attachment, that would be interesting to see.
• Where is the traffic from?
• How does the traffic get to your site?
• How does the traffic perform on your site?

I see a lot of junk in the link profile, such as:

• proinfolink.info
• topseodirectory.co.uk
• netdirectoryltd.info
• seosong.com
• seolinkdirectory.co.uk
• netsitedirectory.info
• ilinkindex.info
• dsubmit.com
• seorganix.com
• seolistworld.info
• bestsubmitsystem.info
• etc

You might consider cleaning those up and focusing on earning some awesome links

How recently?

OSE's index was last updated on May 15, if it was later than that, you won't see any data. Next update is due on June 12. But to be blunt, wix is horrible for SEO - get a self-hosted Wordpress install, with a few plugins you'll be on the right path.

So gald they are gone, it was extremely outdated and most of them were junk. People were still submitting to them due to the fact that they were on an SEOmoz list!

These appear to be tools to check if the site has been black listed for email spam. While it's good to check for when buying a domain, it won't tell you if Google has penalised the site.

Is there a site on the domain at the moment, or has there been one recently?

If there is you could see how well indexed it is (site: command), see if it ranks for it's own brand terms, and even moderately competitive terms.

You can also run the site through opensiteexplorer and see how dodgy the external link profile is.

One of the most obvious ways is to compare organic search traffic to the dates new algorithms go live. Checkout the Google Algorithm Change History page. There is even a chrome plugin called Chartelligence that overlays the algorithm change dates over your traffic data.

Also checkout webmaster tools for messages for unnatural link warnings from Googs themselves.

Hope that helps!

A few things to investigate:

Did you try the site: command? Your post says 'siteaddress:' - I don't know what that is.

What date did this occur?

Have you tried the Fetch as Goole tool in Google Webmaster tools?

Checked for crawl errors in GWT?

Submitted an XML sitemap to Webmaster Tools?

Is Bing indexing it?

<address>The site may be no-indexed (via no-index tag or various other ways accidentally) or penalised, have you investigated either possibilty?</address>

At this point in the game it's really not going to make much difference at all. It's one link that was at one time, thought to be critical. Now, not so much.

Authority labs checks keyword rankings (keywords that you define) at the domain level, and reports if the SERPS are displaying local listing for that particular keyword.

301 the additional domains to the one you want to focus on - except the domain that has the penalty, if you're certain it does.

Four domains = splitting your efforts by 4, splitting your potential links and DA by four etc.

If you work on just one domain, you can put all of your effort into it - this is the way to go.

Very briefly, OSE has a much smaller index and is updated less frequently.

This plugin automatically 301 redirects image attachment pages to the parent post, simply install and activate, done:

http://wordpress.org/extend/plugins/attachment-pages-redirect/

Obviously not a best practice, but should be fine.

What motiveated the change in the first place, then to reverse it?