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 :(
Another Wiki Book which i use.
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.