helenp - 11:53 am on Jan 9, 2013 (gmt 0)
In GWT, on the "crawl error" page you can select each error and by type of error. When you check the links by clicking them, what additional information does it give you about where the links are "Linked From" (that's the name of the tab)?
It's likely the errors are links created by crawl mistakes but it would be interesting to know if they are all from your site or if there are any external links creating them.
This I explained in post just before this post of yours, they are all mine, however as I said, maybe there could have been an external site before