Something seems to have been changed in Arduino 0011, and apparently has broken the AVR stdio.h. The code still compiles in 0010, but gives errors in 11. I thought it might be the order of includes, so I rearranged mine some, but didn't do anything. My sketch needs it for some sprintf junk.
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:263: error: expected unqualified-id before 'int'
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:263: error: expected `)' before 'int'
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:263: error: expected `)' before 'int'
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:264: error: expected unqualified-id before 'int'
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:264: error: expected `)' before 'int'
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:264: error: expected `)' before 'int'
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:417: error: '__put' was not declared in this scope
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:417: error: expected primary-expression before 'char'
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:417: error: expected primary-expression before 'struct'
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:417: error: '__get' was not declared in this scope
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:417: error: expected primary-expression before 'struct'
c:/documents and settings/marc/desktop/embedded dev/arduino/arduino-0011/hardware/tools/avr/bin/../avr/include/stdio.h:417: error: initializer expression list treated as compound expression
If you want my sketch code as well, just holler.