You can play HDTV videos using the SPEs without problems. Examples: http://www.youtube.com/watch?v=DC_qnPNuul4 http://www.youtube.com/watch?v=U4Wul8MLM6E http://www.youtube.com/watch?v=a2SWDGSU5ko
Raytracing without RSX under Linux: http://www.youtube.com/watch?v=ehwFOM4CBKA&feature=related
3D Games running full screen without RSX, using SPE as scaler: Duke Nukem: http://www.youtube.com/watch?v=oJxU98U07gQ
