iTunes Link Maker
With the iTunes Link Maker you can link to certian songs from your blog or website and have them open up in iTunes. Here is an example:
My Favorites (Well, one of each type)
Jimmy Eat World
The World You Love
It's that easy. It will work with Mac or PC just as long as they have iTunes. I think I might use this to link to some of my favorite stuff. Keep your eyes open for it.