Tons of Computer related ebooks :

http://www.iphone-forum.org/showthread.php?t=98821

http://www.flazx.com/

http://lab.lpicn.org/pub/books/

http://feeds.feedburner.com/TechBasement

Computer/Electrical eBooks: http://www.nuneworld.net/?cat=11

Good Engineering books:

http://lovecalc0.tripod.com/engg_books.html

http://lovecalc0.tripod.com/engineering5.html

http://lovecalc0.tripod.com/engineering6.html

http://lovecalc0.tripod.com/engineering7.html

Electrical & Electronics Engineering Ebooks : http://lovecalc0.tripod.com/engineering1.html

Mechanical Engineering Ebooks : http://lovecalc0.tripod.com/engineering2.html

Chemical Engineering Ebooks : http://lovecalc0.tripod.com/engineering3.html

Engineering Handbooks : http://lovecalc0.tripod.com/engineering.html

Electronics eBooks : http://www.edaboard.com/viewforum.php?f=67

Physics eBooks : http://ugottodownload.blogspot.com/2006/01/physics-books-httprapidshare.html

Collection of Interview Books: http://lovecalc0.tripod.com/interview.html

Collection of Stock Market Ebooks: http://lovecalc0.tripod.com/stock.html

Yoga, Religion & Philosophy: http://www.sivanandadlshq.org/download/download.htm

Medical Ebooks Site: http://www1.ctgu.edu.cn/yxy/kxyj/jxb.asp

Classic Literature : http://www.avaxhome.ru/ebooks/medbooksp1.html

Collection of Power Plant Ebooks :

http://www.planetpdf.com/mainpage.asp?webpageid=2330

http://lovecalc0.tripod.com/powerplant.html