I know that running the 328 with 3.3v at 16MHz is "overclocking" it and slightly out of spec. Because of limited board space i'd like to do this though as all other components are 3.3v. I need the 16MHz.
I'm using a TQFP 328 and am planning on burning the arduino bootloader to it and then working with FTDI. I know that FTDI cables come in 3.3v, which should be ok, but i'm wondering what the impact on burning the bootloader will be. Will the bootloader burn fine at 3.3v even if it's actually too low? Other concerns or suggestions?