Matt Cutts this time came out with another batch of answers on video.
Make sure that you have seen the video to get the array of answers. Matt Cutts, under Session 4, Session 5 and Session 6 answers questions on  Gadgets, Google and SEO.
Session 4 talks about Static vs Dynamic urls, geotargetting within Google’s Quality Guidelines, while Session 5 discusses about Merging acquired domains with 301s, site artichecture, A/B testing etc.Session 6 talks all about Supplemental Results.The views expressed on video are of Matt Cutts and not Google, Matt clears.

You can access the video at the following links:

• Session 4
  
• Session 5
• Session 6