It’s a great testament to the power of the Apple marketing machine that iTunes is the most popular digital music service, even among PC users. I have been using Napster for two or three years now and In terms of bang for the buck, iTunes doesn’t even come close.

It’s about renting your music vs. buying it. iTunes charges 99 cents per track for music downloads. Once you have downloaded the music, you may burn it to a CD or transfer it to your iPod or up to 3 other computers. Napster to Go (Named for the infamous Napster P2P system, though not closely related) charges a flat rate of $14.95 per month for unlimited downloads. If you download more than a dozen songs a month, well, do the math.

What’s the catch? First of all, it won’t work with your iPod. There are a lot of compatible mp3 players out there (You even get a free one when you sign up for a 1 year membership). When you download a track, it is rented with a 30 day license. These licenses are renewed on your PC every time you connect to Napster. You have to connect your mp3 player to your machine at least once a month to renew the portable licensing. Also, it will not work on a Mac and does not do movies.

Despite these limitations, the Napster system is still the best. Let’s say for example’s sake, that I downloaded 100 songs last month, they were downloaded practically instantly, and have been on my iRiver ever since. The cost? about $15. On iTunes, I would have paid $100. This is what I pay for 6+ months of Napster service, in which time I will have accumulated 600 or more songs. Remember you can always buy the songs too if you want to keep them forever. Think of it like iTunes but with an additional unlimited music rental option.

When I hear a new song I like on the radio, I download the entire album, legally, for what feels like free. If I really like the album and want to burn a CD of it, it’s 99 cents a track. But who uses CDs anymore?

Of course if you steal your music, the point is moot.