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I am working with a client and have noticed lots of 500 server errors that look very strange in their webmaster tools account. I am seeing URLs like this blog/?tag=wholesale-cheap-nfl-jerseys-free-0702.html and blog/?tag=nike-jersey-shorts-4297.html there are 155 similar pages yet the client does not sell anything like this and hasn't created these URLs.  I have updated WP and all plugins and cannot find these links or pages on the site anywhere but I am guessing they are slowing the site down as GWT keeps highlighting them as errors. Has anybody had any experiences with these types of hacks and can point me in the right direction of how to clean it up properly? Ta

I am cleaning up a clients link profile and am coming across a lot of directories (no surprise) My question is, if an obvious free for all generic directory doesn't look to have been hit by any updates is it a wise move recommending it for removal on the basis that it is a free for all directory and could be hit in teh future?

Lets say I have a commercial website that nobody will link to so I create a non commercial website with some awesome content that is highly linkable. I then get 30 - 40  quality links pointing to this site which I then either rel ="canonical" back to my main site to the page with the replica content or  do I simply add a text link from the new site to the old sites homepage. Which would benefit my commercial site most? We are seeing the strategy of building a non commercial site for links becoming more and more popular.  The second question is is it worth the effort for in effect one backlink?