Hi, I'll be brave and have a crack at this one. :-) Leo and I have had some discussions about moving some packfile related code into PMCs, which sould neaten things up and, importantly, make packfile manipulation accessible to Parrot programs. While I know I'll need to re-work pbc_merge to use those later on, I think I'd like to try pbc_merge first using the current code we have so I can get more familiar with how things are now, before doing something significant inside Parrot itself. Then, provided my supply of Parrot hackery time goes on (it should) I can look at the moving stuff into PMCs task. Jonathan