i listened to the Chilli Peppers a lot as a teenager, Blood Sugar Sex Majik is a classic album, as is One Hot Minute, i've got a couple of their older albums too including Uplift Mofo Party Plan, which sounds a little dated but still quality...
after One Hot Minute i lost interest in the band, Californication and the rest haven't interested me in the slightest, there's a couple of good tracks on Stadium Arcadium but for me they'll never reach the heights of Blood Sugar again...
i've read Antony Kiedis's book, Scar Tissue, which i recommend to any Chilli's fan, it basicaly describes his struggle with drugs, which was quite horrific at times, i thought i'd been on some crazy sessions until i read about his exploits, insanity, it was also great to learn and the history of the band, and actualy understand a lot of the referances that he includes in his lyrics to friends and special times, places they used to hang out etc.