OTA is Over The Air. It allows you download and install programs and such to our Blackberry without having to use the Desktop Manager. It is the prefered method as it will install with very little hassle.
You would click on the loink from your Blackberry and it will take you to another screen with an option to Download. Press download and you will see a status bar telling you of the download and install process. Once this is done, simply go to you Blackberry desktop and you will see a new icon for the program that you installedd
Posted from my CrackBerry at wapforums.crackberry.com