This week I got Teensy++ 2.0 and tried. As a result I found problems.
1. If ADB cabe is long, OSX couldn't detect keyboard. (In fact, it does but couldn't detect any key strokes) I have short cable which is included in Apple adjustable keyboard and three other normal cables. Short cable works good but others not.
2. key stroke is recognized multiple time.
These problems (I Think) caused by my environment...
I changed adb/config.h (I moved port and bit)
#define ADB_PORT PORTB
#define ADB_PIN PINB
#define ADB_DDR DDRB
#define ADB_DATA_BIT 6
#define ADB_PSW_BIT 5 // optional
I should change ADB_DDR/ADB_PIN as above right ?