I just updated my environment from 0.9 to nutch-2008-04-25_04-01-24 and
ran across a couple of warnings
in the tika-mimetypes.xml file. This is what I did to quiet them:

<mime-type type="application/xhtml+xml">
   <sub-class-of type="text/xml" />

changed to:
<mime-type type="application/xhtml+xml">
   <sub-class-of type="application/xml" />

and

<mime-type type="application/x-ms-dos-executable">
   <alias type="application/x-dosexec;exe" />
 </mime-type>

changed to:
<mime-type type="application/x-ms-dos-executable">
   <alias type="application/x-dosexec" />
 </mime-type>

Does this look reasonable?

Bill.