platform: win 2000;
locale: english;
enable russian keyboard layout;
java: 1.5.0-beta b51

To reproduce error you can either try running attached code
or
change layout to RU and use robot to keyPress, keyRelease "[" and "]" onto some swing component.

Exception in thread "main" java.lang.IllegalArgumentException: Invalid key code
at sun.awt.windows.WRobotPeer.keyPress(Native Method)
at java.awt.Robot.keyPress(Robot.java:220)
at KeyTest.performTest(KeyTest.java:82)
at KeyTest.<init>(KeyTest.java:30)
at KeyTest.main(KeyTest.java:34)

==============

Behavior is also questionable for ";", "'", ",", "/".

"," corresponds to a russian "b", sometimes it gets printed by Robot correctly, when it is first in the queue of chars, but when it isn't it fails as well.
###@###.### 2004-06-01

==============

German layout has similar issues.
The following robot events either cause the exception (see above) or are mapped incorrectly: `, -, =, [, ], z, x, /. Capitilizing any of these keys with "Shift" doesn't work either.
###@###.### 2004-06-02