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We have a blog on our site where the homepage and category pages have "noindex,follow" but the articles have "index,follow". Recently we have noticed that the article pages are no longer showing in the Google SERPs (but they are in Bing!) - this was done by using the "site:" search operator. Have double-checked our robots.txt file too just in case something silly had slipped in, but that's as it should be... Has anyone else noticed similar behaviour or could suggest things I could check? Thanks!

Google Webmaster Tools is reporting a heck of a lot of 404s which are due to an external site linking incorrectly to my site. The site itself has scraped content from elsewhere and has created 100's of malformed URLs. Since it unlikely I will have any joy having these linked removed by the creator of the site, I'd like to know how much damage this could be doing, and if so, is there is anything I can do to minimise the impact? Thanks!