Results per user

[Grant Ingersoll]

Hi,

For a given user, I would like to submit a search and return back  
results that are filtered on a per user basis, for instance to remove  
results that have already been viewed.  I know I could post process  
the results from Solr to do this, but am wondering if a better  
solution is to implement my own request handler that takes in user id  
info and manages a cache of Filters that maintains the bit set info  
on the search side.  Is this a good approach?

Has anyone come across this kind of thing before?  A similar idea  
would be how to implement something like Google's personal search  
results.

Thanks,
Grant