I just watched Google’s own Adam Lasnik give an interview at the London SES.  It is gratifying to report that Google, who really founded this notion of sustainable search marketing, is continuing the trend. 

Adam Lasnik is the brains behind Google Webmaster Central and is the liaison between Google and webmasters of all shapes and sizes, keeping us all in the know about what Google would like to see us doing.  Thankfully, it all really makes sense and is sustainable.

1. With regard to use of new Flash and Ajax (Asynchronous JavaScript and XML) technologies, Adam was asked what Googles guidelines are.   The answer is go ahead and use it - it adds to the usability of the site.  Just make sure that you use <noembed> to indicates what text should be used when an embedded object can’t be viewed, and <noscript> to define an alternate content (text) if a script is NOT executed so that no matter who lands on your page, they can get the appropriate content from your flash and ajax objects.  The other important thing here is that you use the same text in those tags that you use in the object’s content and don’t use the tags to stuff keywords. 
2. Duplicate content is another hot topic covered, and one about which I have given some good advice and a little bit of wrong information as well…  Duplicate content is fine if it is inadvertant or useful to the user and is appropriately attributed to the originator.  So don’t worry about putting no follow on your printer friendly pages etc. 
3. Along with the duplicate content question, the idea of page rank sculpting came up.  Page Rank Sculpting is the act of aranging content so that pages you deem important get the best page rank, and isn’t diluted by content on other “less important” pages.  It is a fundamentally unsustainable idea, in that it will have to be rescultped as often as page priorities and algorithms change.  Achieve rank and position for important pages by linking to them from the home page and by obtaining other quality links to them.  The natural way!

What ties all of these ideas together is sustainability.  Don’t worry about the algorithms, or contriving meta information for specific keywords.  Focus on the needs and experience of the user/customer.  Provide them good and useful information in a natural and intuitive manner and you will do well.