The first perl 5.10.1 release candidate was released the other day. As mst says if you don't test it now and it breaks for you when its released its your fault. As a good cpan tester I've added it to my testing setup.
While I was doing this I also added perl 5.8.9 to my setup. I also changed my setup slightly by pre-installing Moose and Catalyst since thats what all the cool perl programmers are using these days. Since installing and testing their dependency chains was burning a lot of cpu, time and bandwidth every time a new module based on them was updated or added to CPAN