Well, if you want to get REALLY geeky about brewing science, you have to hit the research literature. Pretty technical stuff, but it is years ahead of even the most recent books out there.
The Institute of Brewing and Distilling runs one of the top brewing journals that publishes original, peer-reviewed scientific research. Currently, it is providing free
access to all electronic issues on their website:
The Journal of the The Institute of Brewing&Distilling
The American Society of Brewing Chemists runs a better journal (IMO), but it is only free to members (membership is $125/yr -- not a lot).
ASBC Journal Overview