Pocket-lint has a very brief review up. Low noise up to ISO400. Nothing spectacular above that. 8 out of 10 final score
Good Gear Guide has a quick review too. They offer one small low light photo and say that noise is good up to ISO400 but is still reasonable through 1600. According to this review the D3000 has a stop-motion and fake tilt-shift effect filters.
And CNET Aussie has the better mini review. They like it but don't think you should trade in your D40 or D60. They've got some small high ISO crops too.
So this is pretty much what I was expecting. The D3000 is a great little camera for someone moving up from a point & shoot compact and who's still learning photography and doesn't need video. But if you where hoping for D90 or D300 quality at a cheap price than you'll be disappointed.