I've actually been re-packaging/testing Pandora apps to run on the N900 for a while now:
http://talk.maemo.org/showthread.php?t=75992

Here's another port, this one by hadjistyllis:
http://talk.maemo.org/showthread.php?t=76084

I even made available an unsquishfs binary for the N900/N9 that will unpack those Pandora PND files directly on your Nokia:

http://talk.maemo.org/showthread.php?t=76263

Unfortunately, I've found that the N9 is not as friendly a home for Pandora apps as the N900 was. Much like WebOS NDK games, Pandora apps are much harder to get working under Harmatten then they were under Maemo 5...