Science.Gov  5.0 is now available!
The first thing you'll notice is the new main page design. The same elements are there, but reconfigured to update the website look and feel. We have also added seven deep web sources (see DOE press release ) into the search.
If you're a frequent user of Science.gov, you may have had a hand in the recent enhancements. Many of the new Science.gov 5.0 technical features are in response to past suggestions from Science.gov users. Topic "clustering" is available on the Science.gov results so you can drill down into subtopics to focus your research. Presented alongside the Science.gov results is auxiliary information from the AAAS EurekAlert! Science News and from Wikipedia. Also new with this version is the ability to download search results into your citation management software - a specific request from the library community. You will also notice a new Alerts interface which allows you to set up an ATOM or RSS feed of your Alerts.
The Science.gov Alliance has released a major version of Science.gov each year since its launch in December 2002. We continue that tradition with the newest release, realizing that both technology and R&D results from U.S. federal government continue to grow at a very significant pace.
The Science.gov Alliance  is itself an interesting story, a truly unique example of federal agencies overcoming "stovepipes" to create a true cross-agency portal. You may read more information on this initiative and its participants on http://www.science.gov/about.html . OSTI  hosts and manages the Science.gov site for the Science.gov Alliance.
I do hope you find the upgraded features of our Version 5.0 helpful. We'll probably start thinking about the next release before long, so send me your suggestions and comments at firstname.lastname@example.org .
Science.gov Product Manager