I have noticed it too, but honestly am not sure if it is just me or really louder. I have read so many posts about it being louder or softer after software upgrades, exchanges, etc.
I have noticed that the quality of the phone seems to have improved, the screen is brighter and clearer, the bluetooth function is clearer (less static), and I can fit a whole lot of content on the phone now.
I had an 8GB from launch day until yesterday when I bought a new 16GB.