i noticed that member veign has been updating his link200 donationware program:
http://www.veign.com/download_app.asp?app=103
Quote
Link200 will determine the validity of bookmarks or favorites in Firefox, Internet Explorer, and Netscape. Link200 is an easy to use step-through wizard that guides you through the entire process. No longer do you have to worry about going to a favorite or bookmark only to find out the site is no longer valid. Link200 will handle the checking and cleaning. Users can automatically delete the bad websites using Link200's clean option or you can specify which ones you would like to remove on a per website basis.
http://www.veign.com/download_app.asp?app=103