Been there, done that ... I ended up using a very neat Perl script (which unfortunately I now can't find again) written by the guys over at
Think Geek for
this groovy Tux poster to shape the source code into the raven graphic shape.
++Beatnik for the obfuscation though ... obfuscation is good ;-)
perl -e 's&&rob@cowsnet.com.au&&&split/[@.]/&&s&.com.&_&&&print'