Michael has been working on Searchlight again - he's dropped the memory footprint, made it index incrementally, and has some roadmap ideas:

Searchlight version 3 is new, very new - it may have bugs. If it has bugs, please email me about them. It is an incrementally indexing search engine for your image. It also has a vastly reduced memory footprint. My image was dedicating 10.6mb to the indexes, but now it uses only 2.7mb. I could probably reduce it further if I tried, but that's good enough for now (I hope - if you disagree and have worse stats, please email me).

There's more on his blog; go check it out.

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