Here is a great set of technical eBooks free from Microsoft Press. All ten are full books downloadable in PDF format (some also available in Mobi and epub) and… did I mention… they are free!
Download as many as you like: Go to THIS PAGE, click on a book cover and follow the links.
I love having access to free books in a pdf format. By uploading it onto my Kindle, it allows me to have the information at my fingertips.