Sub-Sector Categorizations: Where to find them?

I have been putting together my own categorizations for stock sectors, but this is a TEDIOUS task and was hoping someone had found some good sites on the web that i could reference.

For example, not just biotech sector, that is easy.

Rather who does RNAi, Biodefense, Stem Cells, Neuromodulation etc.

Even better is a list like that and a mention of pure play VS conglomerates. Some 300M biotech may do RNAi as well as Pfizer.
perhaps a close competitor correlation.

Is there such a place that provides this kind of information and does not charge a lot (or hopefully Free).

I am sure there are places but user friendly or able to export data would be good too.

Thanks,
Genomik
 
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