After you download an app look in the download or app folder. Highlight it, push the BB menu button, click move to folder, and then select, Home and it will be on your screen.
It should be located in your my folder account thru blackberry world app store.
Posted from my CrackBerry at wapforums.crackberry.com
Right, but that seemed to be a PITA to use it.. it was in the Downloads folder.. from there, i moved it to the home screen. Very cool. Takes some getting used to (im used to my iPod Touch)