If your Nano G3 will only control Bose SoundDock volume...
If your Nano was updated to v 1.0.3 from a prior version it may not work with the Bose Sounddock. It appears only the Nano's that shipped from Apple with v1.0.3 will work.
Here's the scoop on the SoundDock remote not working exept for the volume. For Christmas I purchased my son a G3 Nano directly from Apple (the red one...it supports aids charities in Africa). I also purchased my wife one from Circuit City. My son's came with version 1.0.3 loaded from Apple. My wife's had to update from 1.0.2 through Itunes when I was setting it up. My son's worked perfectly with the SoundDock but only the volume control worked with my wife's unit. After much brain bashing, I determined that the upgrade version may have a problem, so I returned my wife's Nano to the retailer and ordered one directly from Apple. It arrived on New Year's eve and guess what, it worked perfectly with the Bose Sounddock. So lesson learned...if your Nano was 1.0.2 and was upgraded to 1.0.3, it may not work with the SoundDock. The native version from Apple works fine.