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 Brandon Abbott:
Now you too can be a part of the Linsanity! with the Ultimate Jeremy Lin Fan App.Are you Linsane? or just a Linderella? Linsanity! will measure your level of Lintensity.Simply start Linsanity! and be as Linsane as possible. The louder and more crazy you are the higher your Linsanity! score!Are you the ultimate Knicks fan? See how high you can score! Linsanity! scores are based on loudness and overall craziness of the user.Be sure to share your score with friends on Facebook!Usage Tips:- Linsanity! works best in a quiet area.- Use the Calibrate Mic button if you experience inaccurate microphone levels.