找到Python 3000 与 TortoiseSVN 冲突的问题所在了.
Python 3000 也终于 RC 了. 虽然没有 DLL 的问题了, 不过 IDLE 问题依旧.
还好查到了解决方案:
http://bugs.python.org/issue3628
http://bugs.python.org/issue3815

Just realised how to fix this. Change line 76 in idlelib/run.py:

# change this:
    sockthread.set_daemon(True)
# to this:
    sockthread.daemon = True