This may intrest any of you that have to alot of reserch to do, steven berlin johnson has writen an artical about his experiances with DevonThink software over on his blog.
Here are his top 3 tips,
1) The DevonThink software does a great job at making semantic connections between documents based on word frequency.
2) I have pre-filtered the results by selecting quotes that interest me, and by archiving my own prose. The signal-to-noise ratio is so high because I've eliminated 99% of the noise on my own.
3) Most of the entries are in a sweet spot where length is concerned: between 50 and 500 words. If I had whole eBooks in there, instead of little clips of text, the tool would be useless.