Not sure..
There seems to be a fair bit of Cell-related news and new info floating around today
Remember the Toshiba demo with 48 SD Mpeg2 streams? Apparently they have 1 SPE handling a 1080i (1920x1080) stream by itself - so..6-8 1080i streams simultaneously on one chip? I certainly don't think any current desktop CPU could handle that
(my 2.53Ghz P4 can't handle 1 without stutters).