IS there a list online of the songs they have ?

Only by using the program. Feel free to download it, you don't need an account to browse the store, and play 30 second samples. Only when you go to buy do you need an account.

And my Apple ID e-mail has yet to see a piece of spam, so don't worry about that.

Also, bear in mind any song that you buy there will not work on the empeg unless you first burn it to CD, then rerip the music to MP3. I'd like to see an AAC decoder on the empeg/Karma, but doubt it will happen. I also highly doubt that if the empeg/Karma got AAC that it would also support the FairPlay DRM. But I can dream.