The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Qbiki Networks:
Dial-A-Muse is an interactive dynamic app exclusively for the iphone. Also known as "Throwing Muses: A Pocketful of Mumbles and inspiration for Creative Persons," it is a guidebook to finding inspiration. No artist, writer, or musician should be without it. It is jam packed full of inspirational quotes, hints, tips, and tricks on locating and holding onto your muses. It's full of sound as well as vision, tap certain images for the sounds, open your eyes for the visions. And, of course, it's a touch tone dialer to some of the greatest muses we know. Content will change constantly ensuring that none of us are ever without fresh inspiration.