pageoneresults - 6:28 pm on Mar 17, 2011 (gmt 0)
We will either 404 them or leave them as is.
You'll want to 410 Gone all of those if they don't have an equivalent replacement that you can 301 to. The 410 will act just like a URI Removal Request and they'll be gone after the next crawl of the site. They get removed pretty quick once that 410 is seen. 404s are too vague and those URIs will continue to be requested if there are links pointing to them. Also, it may take a few crawling cycles before they get removed from the index.