Turning pages are noticeable faster. Overall it feels more responsive.
The power on/off key now doesn't bring up a menu, and turns off completely if you hold it for 3 seconds, while tapping shorter it sends the device to standby.
Unfortunately neither the long-awaited folder management nor a search feature has been implemented. I think we'll have to wait a bit longer for that.
Meanwhile on February 10, 2011, there will be a new version of the Oyo with 3G integrated. That means you can use cell-phones networks to get access to the online-store from everywhere.