I have recently started using Google Desktop Search. I find this
extremely useful at the same time the following improvement would add
great value to this product.

While doing search, very often I come across several documents -
sometimes in hundreds and there should be a way to identify the
document I have already referred from a search so that I don't open it
again. First of all the search should be available in the form of a
table that I can re-use with a check box to identify the document I
have already referred from the search result.

This will feature will be very useful whild conducting research on any
topic referring several hundreds of documents.