All I can say is uff-dah! Google has released Google Scholar, a search engine that searches more specific scholarly sources. For example, I ran this search on “reactive power”, and it turned up a bunch of useful engineering citations that would be more difficult for me to find through my university library. And if I didn’t have a university library available to me, I might not be able to find them online.
It also reports citations to various sources, and you can click through to the documents citing the sources, much along the lines of the Social Science Citation Index.
Yee hah! This is a happy day, particularly if you work in an interdisciplinary research field like I do.
Thanks to Rand Simberg for the link.