RefSeek - an academic search engine

RefSeek.com is a web search engine for students and researchers. RefSeek aims to make academic information easily accessible to everyone. RefSeek searches more than one billion documents, including web pages, books, encyclopedias, journals, and newspapers. The interface is Google-like, and the results are fairly basic - title, summary, url, date with a 'search this site' option. There's also a 'narrow this search' option. They have a directory section for almanacs, dictonaries, health, news, quotations and so on. Boolean is supported, but not much else.