There is the Text::Ispell module from CPAN.

If you have a dictionary file (like /usr/dict/words under UNIX) it is easy to write a simple misspelling-detector in perl:

my %dict;
open D,"</usr/dict/words";
while(<D>){
  chomp;
  $dict{lc($_)}=$_;
}
close D;

my $text='Is there anyway to write a spell checker in perl?? Please he
+lp.';
my @words=split /[^a-zA-Z0-9']+/,$text;
foreach (@words){
  if(!defined $dict{lc($_)}){
    print "\"$_\" is not in the dictionary\n";
  }
}
[download]

This could be enhanced significantly, but will get you started on the right path.