Be very careful. A site "..that is no longer up.." may just be undergoing maintainence, or is only down temporarily due to server problems. Does this program check for all these things? Does it know if the site is not there because there is a server error? For all you know, that site could return an hour after you deleted it from your Favourites and you have lost a good bookmark.
I would not get rid of good Bookmarks so quickly.
EP, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS