I think it's pretty handy. For a full SL experience I'm always going to be using one of the typical viewers on a PC. For mobile or even logging in via browser it's just going to be for the ability to be 'present' for chat and IM's. Regarding the streaming idea - was that ever directly stated or implied? Or was it just assumed that "SL in a Browser" meant a streaming service? Nothing about this particular announcement led me to think streaming, so I was neither surprised nor disappointed by what I found when checking out speedlight.