http://freebooks.by.ru/

Lots of stuff there. Most of the site is englishbut there is some russian. There are all sorts of references there, very cool!

my gosh iphitus, that is way cool!! how did you find all that? iphitus, man you rock!!

How do you access the books? I couldn't get beyond the linux biook page, there seem to be no active links

Just click on the open book symbols - but beware! Opening one of the books on C caused some weird effects. The new window wouldn't close and some other applications ceased to respond. I had to log out to correct the situation. :(

VERY cool.

But: is this legal??

No, it looks like many of those books are not legal, as they were never posted in any Open Content License nor distributed as free by the author/publisher.

FreeTechBooks has some information over legally hosted e-books I have known:
http://www.tcfb.com/freetechbooks/index.html

Dont forget the ldp either !