Free iTunes Downloads: This blog keeps track of free music downloads available at the iTunes Store and provides a link to download individual songs.  Apart from music downloads, the blog also tracks free video downloads available on iTunes Store.

iT’S Free Downloads: The site is much like the one mentioned above.  It keeps track of all free downloads available at international iTunes Stores.  They also provide a widget for your MySpace profile, a Facebook application and a iGoogle Gadget which shows the latest free downloads available on various iTunes stores.

Free-MP3s.eu:  This site allows you to search for free music downloads across 3 sites viz. iJigg, MP3 Realm and Esnips.  I suggest searching through MP3 Realm as it shows good number of results for available downloads.  iJigg also provides decent number of results but the links in search results from iJigg didn’t seem to work when I tried downloading.