If you have a music oriented website and are affiliated with Amazon.com and/or iTunes (as well as several others), this is a very useful plugin.
My site is focused around Asian Pop music, Asian Pop Videos, and many of the songs I am searching for are not easy finds. Before, I needed to have several pages open and be bouncing back and fourth to get the job done. With this plugin, my work has been simplified greatly.
One very simple search box below the post editor gets it all done with exquisite ease. Placing inks to artists and songs, as well as embedding player widgets, into posts, can all be done with simple clicks in the results area. And the searches start automatically as criteria are typed into the search box. The results themselves are at least as good, if not superior to searches done through Linkshare (itunes) or Amazon. (You can even visit the iTunes website to see the artist's/song's/album's page right from the results areas as well)
And if you look in the support area, you will notice that Brady Vercher is very active in assisting users with any problems they are having; this is not always the case with free (or even premium) WordPress plugings.
This is a high quality premium level plugin, and as soon as I start to turn a profit, I will be sure to buy Blazer Six and Brady Vercher several cups of coffee!