A new update to the Arduino development environment has been released.
[
arduino.cc]
Among the changes are: "Upgraded to newer versions of avr-gcc (4.3.0) and avr-libc (1.6). This provides support for newer Atmel chips, but may increase the size of sketches."
I imagine this may cause problems for the RepRap software which is very close to filling all available space in an Arduino Diecimila. It may be good news, however, for the Sanguino.