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 Michael Gbel:
iDisk and Dropbox Support Due Dates for Notes Alert for Notes with Snooze Global Hotkey Link/Email Address Detection iTunes like Search Create Notes without Mouse Create Notes from Cipboard Import/Export/Print Notes Can be operated by Keyboard only MOAppsNotes - The most simple and elegant way to keep notes.Notes is extra designed for speed, ease of use and most important of all - to keep your notes in sync when working with multiple Macs. That's why I am already working on an iPhone companion appSometimes a note is nothing else than a reminder or a todo - so why use two different applications or one of those overengineered GTD apps when your notes app can do that for you? Of course you can also print, export, import notes or even backup and restore your complete notes library.And because most of us are already working with the iDisk or Dropbox - there is no need to create another sync-service or to extra long-winded log into one - only to sync notes. You can even use your Time Capsule or a Thumb-Drive to share your notes across multiple Macs