According to eWeek, A9.com (owned by Amazon) has introduced a new concept called OpenSearch which allows “vertical search engines” to be added to the A9.com search engine which Amazon introduced last year. A9 wants to do for vertical search syndication what RSS has done for content syndication.
I played around this for a while, and while the user interface takes some getting used to, I really like being able to do a search, and then click on my vertical search engine tabs on the right side of the screen and get very different results, without retyping the search.
Let me know if you find this interesting. I guess with Google, Yahoo, and MSN so far ahead in the search space, A9 has to do something to bring in niche audiences who might like these vertical search options. I think this is a clever move.