I don't see <> as being bad, but have more things for the list:

• Using BAREWORD filehandles
• Not checking for return values (IMHO one of the most important things about OO filehandles is that they force you to check for errors, pretty much -- possibly more important then timely closes and clean namespaces)
• Any module longer then a few hundred lines (should be split up when possible)
• Not using DBI when applicable.
• Not using CGI.pm when applicable.
• String eval, string do.
• Assigning to $_ without localizing it.

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