After looking at various algorithms and what not, I've settled on a (sigh) ready made solution, swish-e
Its pretty cool, and while written in c, has a perl API which is quite nice. Its extremely fast for filesystem index scans and terribly slow for web spidering (not surprising really), (props tachyon).
My site is a dynamic photo album site, not static html pages. As the content I want to index is stored on the FS, the scan takes less than a second (as opposed to 33hrs spidering) with swish-e.
I've learned (not heaps) but a little more about search engine's, and know a bit more about the different algorithms and the advantages/disadvantages of them.
Again, unfort, the Vector Space alorithm referenced above did not meet my needs, with completely irrelevant results, YMMV. I've not delved into the nitty gritty of how/why, but its on my list of things to do.
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