Details are stupidly scarce on this right now - there isn't even an XDA thread, and Google's not showing any hits either - but YouTube user jacememes has uploaded a video of a NOOKcolor running an Android 2.2.1 AOSP (Android open source project) build. That's certainly a fast turnaround time, given that the device was just rooted a few days ago.
The video was shot with an Android phone, so it's not the best quality, but it's more than enough to show what it needs to. Unfortunately, it's fairly short - 1:41 - and about 40 seconds of that time is just the NC booting up, meaning that in the following 1:01, it's slow because it's still loading everything. Still, it's progress, and the NOOKcolor is really starting to look like a pretty sweet deal for a nice Android tablet, isn't it?