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 Wild Palm:
Hear This! is the easiest way to tell your friends about the music you love!Hear This! lets you publish the music youve been listening to with a single button. Hear This! automatically scans your iTunes library on your iPhone or iPod and shows you the music youve been listening to recently. Click the Publish button and the details are automatically posted on your Facebook wall - complete with automatic links so that your friends can listen too!Hear This! features:- Automatic scanning on your music library - no need to manually select tracks.- Automatic generation of links - everything you post has a listening link so that your friends can hear what youve been listening to.- Re-listen to any of the recent tracks or albums. Simply press on the album art on the screen and you can either play the track or album immediately or open in iTunes to find similar music.- Select which details to upload - simply click on the tick to the right of the screen to toggle which details are uploaded- Automatic Facebook signin - Hear This! can optionally remember your login details so that you do not need to sign into Facebook whenever you pubilsh details.Note that a Facebook account is required to use the Publish feature of the software.