hakia has updated their Search Box, which is a site search feature you can place on your website. The biggest change is the ability to search multiple domains. Here's a mockup, via the hakia blog:
Another update is the highlighting of the semantic relevant words in the results:
Search box is available for free, up to 30,000 searches per day.
hakia Launches Personalized Search Feature
Meet the New hakia
hakia Calls for Librarians to Contribute Credible Web Sources