Sorry, this is a total newb question. I had been running 2.1 stock. I have never done anything to my phone, but i got so excited to see a manual update was available, that i just updated via the update.zip method. now, after reading most of this thread, did i just screw myself by not waiting for the OTA update? Did i void my warranty? Did i just "root" my phone without knowing it? Do I need to reset it somehow?
Sorry for all the questions. Thanks for your patience.
No, this is the same as the OTA update, but you just did it manually. If you just downloaded from Samsung then you have not rooted your phone. You should be good to go.