It's a bit of a long read, but worth it if you want to understand the differences and similarities amongst Google Universal Search, Ask 3D, Yahoo!, and Microsoft Live.
Lee Odden of Online Marketing Blog writes about it.
Small Business Guide To Optimizing Universal Search
At the end, Lee talks about new challenges in SEO to help optimize for universal search. Particularly intereszting are the comments about embedding video and images about product launches with relevant text, descriptions, and keywords or tags to help bump the product into multiple universal search opportunities.
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