There's currently a battle over which format the HiDef movies are gonna come out on. Blu-Ray was developed by $ony and HD-DVD was developed by Toshiba. Both have some benefits. Last time I checked $ony and Toshiba were trying to settle on one standard. They were thinking about putting best of both worlds into a single standard.
I'd hate to see HD-DVD and Blu-Ray to come out, as all $ony sh*t will be Blu-Ray and everything else will be HD-DVD. Look at the digital cameras. Most of all digi cams take SD cards, no one other than $ony takes Memory Sticks, except for some Samsung camrecorders, but they also take SDs. So that only leaves $ony. Olympus and Fuji are xD, but they don't make up that much of the market.