Brenda--
The Nike + system only works with the iPod Nano.
The reason is that your new, very cool, 60GB iPod has a regular hard drive, that theoretically, can be damaged while exercising.
The iPod Nano has a flash based drive--this means that there are no moving parts and cannot be damaged during regular exercise.
I think the Polar works only with Adidas--no interface with iPod.
Apparently, this site has been working on a way to upload data from the Nike + device.
Enjoy your new iPod.
Ask Santa for a Nano ;)