TweetRad.io is an interesting idea. They grab the hottest topics, using text to speech technology, and make an audio stream from it.
Ok at first I was not so sure, but damn. I clicked the tech channel and it started reading out tweets saying things like “Mashable says …. <tweet here>” removing the links. Quite awesome as background noise full of information.
I really like this service for some reason!! I then noticed I can type in any username strings in the search. I did some friends and the radio starts like it is scanning stations. Static, partial words, etc. This is when the text to speech must be working. Soon enough it was reading tweets from those people.
While there was a lag there, it was a great way to have it catch me up while I read other things. Protected streams cannot be read of course and there is no authentication required to use the service.