Well for starts, I'd be happy to take people onto the PPI project.

Now that it is at beta, most of the hard problems have been solved, and a lot of what is left are things like testing, playing around with it and seeing what breaks, and starting in on the higher order things...

And as big perl projects go, this is going to be one of the bigger ones, so you get to see a number of interesting and tricky things at work.