I put them into a spreadsheet that shows a 4-level hierarchy of concept, sub-concept, sub-sub. Then i roll up the spreadsheet into strings, LOAD DATA INFILE to

I put them into a spreadsheet that shows a 4-level hierarchy of concept, sub-concept, sub-sub. Then i roll up the spreadsheet into strings, LOAD DATA INFILE to a mysql db, and index using Sphinx and SOLR/lucene. All this is pretty easy using rails (or Django, PHP, or grails, I imageine) (or write some memo's, use Google desktop to index them). The important thing is describe your business plan/Cconcept in a way that you can find it using your search terms.