removing site from webdb

[Insurance Squared Inc.]

We've got a site that is causing our crawl to slow dramatically, from 
20mbits down to about 3 or 4.  The basic problem is that the site seems 
to consist of huge numbers of pages that aren't responding.  We can 
remove the site from the index, but it seems like a problem to remove 
this site permanently from the webdb so that we never fetch it again.  
Is there an easy way in 0.71 to remove a site from the webdb, and then 
keep it permanently removed?