Technical search engines

Here're a couple of technical search engines that I've come to use frequently:

CiteSeer: This one's a true goldmine that I've been using since the last 5-6 years
Scientific Commons: This one's a recent find, acts like a frontend to CiteSeer and probably other engines.

Writing a Whitepaper

Did this Google search and found something for starters like me

http://www.mwknowles.com/free_articles/white_paper/white_paper.html