Where Tcl and Tk Went Wrong http://journal.dedasys.com/2010/03/30/where-tcl-and-tk-went-wrong – a very important read for every Perl programmer!
Perl Programming/Unicode UTF-8
Just read a nice and clear tutorial on Unicode in Perl by Mark Rajcok.
http://en.wikibooks.org/wiki/Perl_Programming/Unicode_UTF-8
For more on Perl Unicode you can also go through perlunitut.
regards
Pradeep