At my day gig, we usually post around 25-50 photos a week online with stories. The images are a mixture of those taken by our staff photographer and also a bunch from istockphoto ($$$).
I've been in the habit of keeping all these images each week with the intention of re-using stuff, however a year later I haven't started and the # of images is huge. Nothing has been tagged either.
I'm now planning on tagging all these photos and trying to setup a search index for them...but I'm looking for the right software for the job (open or proprietary).
Would be nice if it's supported by both Mac and Windows and more than one computer can access/share the index.