Here I will try to add links to text books in (pdf format) which are avaiable for free. [ Mostly Electrical Engineering Stuff]
A Very Famous Book From Texas Instruments. I love to read this book.
I think you can learn almost all the basics about DC circuits from this book. This book is used for training US Navy personnel.
Even This book is from US Navy. Good for some one wants to start about AC circuits.
This book covers every thing you ever think about Amplifiers.
One more source for Texas Instruments guys. You can get more information than what you can get using OpAmps For Every one book.
I used this book when i was desperately in need of learning about thermocouples.
All you need to know about Motors and Generators starting from principles to applications.
This is from Analog Devices, the way they have explained about Instrumentation amplifiers is commendable. A great source of information for designers.
If you want to know about Low Voltage Differential Signaling this is the starting source as national instruments guys are pioneers in this technology. Infact they have invented LVDS signaling.
I personally Learned Very basics about Signal Integrity from this source.
If you want learn some basics about CMOS Analog Design this is a great start. The author is very famous and has infact worked on some CMOS technologies.
Great application notes from Little Fuse. Thanks to them.
Another Source from US Navy tranining material.
Everything you ever want to know about Zener Diode.
This is a Wiki Book. I have uploaded it here as i love that book. I have learnt about poles, zeros and system stability from this book.
This is a very famous and free book available on internet about probability.
Another Wiki Book which i use.
Great Source For Semiconductors Basics.
Due to Space Constraints some more E-books are added at the above link.
Other links where you can get some text books:
Great Website with lots of books but the sad part is it is always very slow :(
The best i have ever used but i think it is down from some days :(
Great source of information for Electronics books.
Links to lots of Ebooks for any field. from engineering, physics, science to literature and novels etc...
Best of all I always try to use this website though.
This is Good one.
Good one too Especially lots of books on Software
These guys have used almost same concept as Youtube guys but the difference it this is for books.
Great site though. Only drawback is it will ask you to create a Username with atleast 24 letters which is tough to remember.
You can get links for lot of books which are present in rapidshare.de, mihd.net etc.. good one.