Nvidia touts GDDR 3 'First'

"GDDR 3 runs at up to around 1.5 times the speed of GDDR 2 yet consumes half the power, thanks to a lower operating voltage: 1.8V compared to 2.5V. GDDR 3 provides an aggregate bandwidth of 6.4GBps per device, thanks to a 1.6Gbps per pin data rate. It clocks between 600MHz and 800MHz."
This could mean for some really huge gains in video performance. This will of course depend on how efficient the GPU is in "feeding" the new memory.

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