Matt Cutts you know the official blogger for Google has pointed out the alt tags is very important and that we should subscribe to the webmaster blog by Google.
You should always listen to what he says even if he sometimes talked about his cat or something. There almost all the time hidden secret messages in what he says. So maybe he is talking about the cat but what’s behind the cat, know what I mean?
Now try to figure out the secret with alt tags when looking at this Google video

Matt Cutts has written to Search Engine Journal and told them that the PageRank that happened this week was to correct the paid links to gain PageRank. No shit Matt!
Matt Cutts said
The partial update to visible PageRank that went out a few days ago was primarily regarding PageRank selling and the forward links of sites. So paid links that pass PageRank would affect our opinion of a site.
Going forward, I expect that Google will be looking at additional sites that appear to be buying or selling PageRank.
There is no word when the next PageRank is going to take place or what we should think about until then. But Google has to blame themselves they are the once that created PageRank and people use it and abuse it out of Google’s control right now.
The word goes out even stronger don’t sell or buy link you get spanked by Google or at least by Matt.
Web directory penalizations
Google is punishing so called Directory rings and paid directory and taking away links coming and going from them. It has been a lot of talk on different forums what’s really going on but not many people know how they really determine what link that should go away or not. We can just see one paid directory after another loosing PageRank and the owners are crying out.
Matt Cutts warned the paid directory people long time ago so this was something that expected. But still it must be terrible for those how are affected.
You can read more about the web directory penalizations here
Search Engine Optimization for WordPress by Matt Cutts
Matt Cutts from Google gave some advice about white hat Search Engine Optimization Tricks for WordPress on the 2007 word camp.
Most of what he did not talk was the Google Dance that everybody want to know when the PageRank is going to be updated but he told the bloggers some interesting things.
Don’t use the main domain as your blog use a /blog or whatever name you like but not WordPress like I did here on my Thailand Blog.
Use good SEO friendly category names.
Use Stephan Spencer’s SEO Title plug-in
Do the standard pings and make sure you send out RSS
He also said that please mark all pictures, video and audio its going to be important for the future.