You must already know that more and more sites uses javascript (in one way or another) to make the design of the site more shiny and more attractive for the visitors. Some uses simple javascript functions, others uses metric tones of jQuery or Ajax.
If you are wondering if javascript is good for search engines optimization of your site, the answer is still NO. There are small steps in that direction, but you should know that the spiders grabs the html (static) code, including the content. If you are intending to use javascript to dynamically generate URLs and/or content in your site don't: the crawlers will ignore it. jQuery and Ajax are good for creating animations, but the spiders won't stop to watch them, their job is to read the URLs and the content and go further.
When the things will change, if they are going to change, I'll let you know about that.
