The history of my fetish regarding wanting to search, via indices, my network drives, has lead me on quite the merry roads over the years.
LookOut was cool, but it was absorbed into Microsoft and then emasculated.
Google Desktop is okay, but it will not search network drives...period. Too many odd errors.
I had basically steeled myself to accept that I would not be searching, via indexed search, my network drives. Then I bought a new DVD burner, with a copy of Nero 7. Nero installed a search indexer, pretty much like Google Desktop, but it indexes network drives like a dream. I instructed it to ignore my local drives -- I'll let Google Desktop continue to do that -- and I point it only at the network stuff. Very slick.