Perl 5.14 is near to be released, and RC1 is out. I'm reading the perldeltas documents looking for nice features. First of all, I'd like to send my congratulations to this fantastic team of people who has done it possible.
Since Perl 5.13.6 (documentation), you can now use the keys, values, each builtin functions on arrays (previously you could only use them on hashes). In fact, this feature is available in Perl 5.12, but it was not documented in perldelta, and I'm using it now.