Well, I just thought it would be nice to share this among the forum, just in case it helps someone. I have a Core 2 Duo macbook pro, with Snow Leopard inside, and my disk shared between windows 7 and OS X. Lately, I had noticed a very strange behavior. Spotlight did not show any results! The spinning sign to the left of the blue search bar appeared to be running, but no results whatsoever, I did a rebuild on the spotlight index. The process took about 4 hours, and it worked just fine after the rebuild. Until I restarted the computer, where the problem reappeared. In Activity Monitor, the 'mds' utility took about 10 mbytes of RAM, and my hard drive was working with transfer rate about 3 mbytes /sec (whith no process running with above 0.3% CPU usage). Which got me thinking that this may be a HDD issue, where spotlight is searching my HDD for something, but due to some problem, it couldn't find it, and it could continue until it does. I then included my Boot Camp partition to the list of folders that shouldn't be searched by Spotlight. Voila! It worked. The Boot Camp partition was NTFS, and I had NTFS-3G installed to read and write to the disk. But it seems that NTFS isn't spotlight friendly anymore, so I excluded the disk from spotlight searching and everything works fine. Still doesn't know why the problem appeared after a year of including my Boot Camp partition to the searches, though.