Howcast recently released a free streaming video app that gives you access to their catalog of How-To video guides from your BlackBerry. I tried the app and was impressed that the experience was pretty seamless but I could not find any videos I was interested in learning more about.
The app is free so if you were looking to learn a little while out and about it might be perfect for you. Right now the app is only available for the BlackBerry Bold 9700 and BlackBerry Storm 9550 but it is coming to more devices soon. You can pick it up in App World at this link.