We mentioned Neurons awhile back. It's a video streaming app dedicated to science and features TED Talks, Fora.TV, Science Dump and The RSA. Designed by Justin Angel, it's quite useful and nicely laid out.
It's free, available now and quite impressive. Unlike the TED app which I covered last week (see here), this will work over 3G, making it much more practical. It's open source, meaning anyone can improve upon it if they wish and integrates with the Music & Video hub nicely (i.e. previously watched material shows up).
The program is solid and has some nice pizazz to it. Highly recommended for those interested in all areas of science.