Best way to prevent standby stopping the browser's streaming audio / radio
This approach has been mentioned before but until now I don't think anyone has pointed to a free way to do this. Feel free to correct me if I'm wrong.
1. Make sure in the General settings that Application Behavior is set to Showcase.
2. Once you set up the PlayBook browser to stream the audio you want (e.g. Drone Zone on SomaFM: Served best chilled, safe with most medications. Atmospheric textures with minimal beats. - Commercial-free Ambient Radio from San Francisco) then run the SilentNoise app. Download/update it if you don't have it. That app got a bug fix release today (5th May 2011) which correctly calls the PlayBook's API to prevent standby from kicking in. You do not need to get SilentNoise making sounds. Just the fact you have maximized it will cause the PlayBook to turn off standby.
3. You can go one step further and gesture up from the bottom bezel to see all your running apps, including the browser, but you cannot maximize the browser because it will set the standby back to the default.
4. If you do maximize your browser then just remember to re-maximize SilentNoise afterwards.
By the way, I'm not associated with the writers of SilentNoise. It is just the only free app I know of currently that does the right thing with the standby API. Clock app writers take note!
I bet there will be a setting fix in the OS at some point for turning off standby.
PB Bob