The only multi format video playback software available via appworld has a 2 week trial period and ugly GUI and needs access to wi - fi internet to work everytime. (patchworkoftips.com)
RIM has their own appworld, dev's just need to port their app's over.... (bgr.com)
Note: You can download Moon + Reader by clicking here (you must know how to sideload android apps to install it) and Aldiko Premium is available free of charge via Blackberry appworld. (patchworkoftips.com)