When browsing a P2 repo and clicking the Save As... button, a dialog pop-ups with the header "Open". And there is no way of specifying a name of what to save.
When clicking Cancel in that dialog I get an error message saying a NPE occurred.
This is on Mac OS 10.7.4 with Apple Java 1.6.0_31. I started the P2 Browser through web start (the link in the GitHub readme).