If you have an iPod and want to add particular song or album to it without iTunes (its a pain in the *** if you have sync'ed your iPod from some other machine), Floola is at rescue.
I love Floola, its a donation supported software which I would say is almost as good as iTunes for transferring songs from/to iPod!
Download Floola from here,
And get free from chains of iTunes!
PS: iTunes is great at Podcast management, and I love iTunes for it, but Music management with iTunes (with multiple machines!) is really bad! How it makes sense when you have 5 machines around you, and you can transfer music using only one machine !!!