Thanks to Phyll Sheng, I came across this great article over at CHA DAO on some of the biochemistry behind Darjeeling and oolongs. If you're interested in this sort of stuff, definitely check it out-- there's a lot more info there than in my previous post about astringency and polyphenols.
Notes on the Biochemistry of Tea
The Chinese Tea Company - Brewing Puer Cha
1 week ago