One of the developers contacted me this morning and is writing a SportTracks plug-in to:

1) access the XML files on iPod Nano's
2) pull data from your nikerunning.com account (as iPod Touch doesn't allow access to the XML files)

He's testing option 2 with me.

If and when he's ready for more testers, I'm sure he'll post on the SportTracks forum. Keep an eye out. Look for old_man_biking's posts. He writes some terrific plug-ins.