I managed to make it to Copenhagen for the Nordic Perl Workshop. First off was Maddingue with Old Perls and new code: on the little things which he has to do to support CPAN modules on older Perls. A neat talk and sounds very much like little annoying things which crop up over and over again: such as qr// only actually being used in test suites. I fear that 5.10's new features will annoy him ;-)
Update: check out his slides.
