TODO for avr-libc:

 - better ATmega323 (formerly known as ATmega32) support
 - add support for ATmega8/16/64/128 (datasheets now available!),
   AT43USB320, AT43USB355, AT76C711 support (binutils and gcc need
   to be updated first, new -mmcu=... names and linker scripts)
 - fix signed/unsigned gcc warnings (qsort.c, strtol.c, strtoul.c)
 - finish porting newlib to AVR (may be useful especially for
   larger devices, and for testing avr-gcc itself...)

