There is a shell script that worked great for me going portage->paludis on the paludis.pioto.org site.
I have no experience running the two in parallel, but I'll venture that you'll move away from emerge rather speedily. ;)
After switching to paludis, I installed layman, and used it to kick-start some of the overlays.gentoo.org stuff. Paludis expects more discipline, apparently, and there was some manual effort to configure, say, the emacs overlay. Had to create several files and directories to silence the error traces.
I think there is some provision for using the old-style emerge configuration files, but paludis again does a better job of herding the cats into a few coherent files.
Hats off to emerge. It had a great run.
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