Sony debuted its PlayStation Portable in Las Vegas yesterday, hotting up the portable game market even more. The PSP will go into direct competition with the Nintendo DS when it is finally available for sale.

No prices were given at the PSP launch, which took place on the eve of the Consumer Electronics Show which starts today. Sony executives did say the PSP will hit US stores by March this year, but didnt say how many would be available.

Nintendo currently holds 98% of the portable gaming market.

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