RIM's BlackBerry App World now supports buying apps and pushing the downloads to your BlackBerry from a computer. RIM has implemented BlackBerry App World 2.0, which lets you purchase and download apps from the computer.
"To use this feature you'll need a BlackBerry ID and browser plug-in to facilitate the PC-to-phone transfer. You'll also need to plug your phone into computer during setup and make sure you've the most recent version of App World on your BlackBerry. After that, pressing Download button on a product page in the App World online storefront should trigger a download."
In addition to purchasing apps online for BlackBerry download, App World 2.0 catalog lets you access reviews and recommendations and gives you a My World management page that's linked to your account.
Previously, online App World catalog brokered downloads on your BlackBerry in a roundabout way that helped little. Clicking the "Download" button triggered a text message that contained a link for the app's page in the App World App on your BlackBerry.