Selecting First Letter

I'm struggling with coming up with
a solution to the following problem:

I would like to be able to select the 
first letter of the first text node
within a hierarchy, e.g., the "S" here:

  <content>
    <p><a href="...">Some</a> Text</p>
  </content>

and create a new element with that letter
while keeping the rest of the structure
as is, e.g:

  <content>
    <p><a href="..."><b>S</b>ome</a> Text</p>
  </content>

Essentially I'd like to do an <xsl:copy-of> of
the <content> element, with that one additional
element injected into it.

Any help or ideas would be greatly apprecitated.

Thanks,

Jeff

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