Matt Cutts has just released another video.

Key points:

• If you’re “caught” in data updates (presumably that means your pages aren’t showing up) you might want to stop listening to SEOs in forums and back off optimising quite so hard (I’m paraphrasing – however he hints at over-optimisation penalties and SEO footprints)
• Matt talks about the infrastructure updates. While the software updates have had the occassionla bug, they have been going smootly
• site: results should get more accurate
• Add quality content (no surprises there)