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I'm experiencing a similar issue. Fresh install of 3.3 today from the .msi installer on the web site, identifies itself as:
Python 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit (Intel)] on win32
To reproduce: Copy and paste this character into IDLE. H
C:\Python33>.\python -m idlelib.idle
Traceback (most recent call last):
 File "C:\Python33\lib\runpy.py", line 160, in _run_module_as_main
 "__main__", fname, loader, pkg_name)
 File "C:\Python33\lib\runpy.py", line 73, in _run_code
 exec(code, run_globals)
 File "C:\Python33\lib\idlelib\idle.py", line 11, in <module>
 idlelib.PyShell.main()
 File "C:\Python33\lib\idlelib\PyShell.py", line 1477, in main
 root.mainloop()
 File "C:\Python33\lib\tkinter\__init__.py", line 1038, in mainloop
 self.tk.mainloop(n)
UnicodeDecodeError: 'utf-8' codec can't decode bytes in position 0-2: invalid continuation byte
(Incidentally, there appears to be a slight difference depending on whether I copy the character in Chrome or Firefox. IDLE terminates the same way, but a Latin-1 app sees the character from Firefox as a letter, but the same thing from Chrome is two question marks (presumably the surrogates).)