tedster - 2:52 pm on Aug 15, 2010 (gmt 0)
do you recommend to return a 200 OK for URLs you don't want to handle instead of a 301
Not exactly - I meant that if you are trying to preserve that backlink's equity then you should have content related to the original content for that URL. Then you can return a 200 OK. In some cases, it is conceivable that the home page could serve that function, but in my experience that's a rare situation.
If you put yourself in the place of a user who clicks on the link, I think that communicates my idea a bit more clearly. Such a user would not be well served by ending up on a page that doesn't relate to what the link promised. And if a site routinely serves many 301s, pointing to the same target page for diverse backlinks, that's the situation where I sometimes see ranking problems coming up.