Not quantum physics, but if you want to read a real classic, there's also Weyl's <i>Space-Time-Matter</i>, which is mind-blowing in its lucidity and ambition (unifying GR and electromagnetism): <a href="http://archive.org/details/spacetimematter00weyluoft" rel="nofollow">http://archive.org/details/spacetimematter00weyluoft</a>.<p>Well, while I started, why not add a list of freely available physics books online from PSE: <a href="http://physics.stackexchange.com/questions/6157/list-of-freely-available-physics-books/7382#7382" rel="nofollow">http://physics.stackexchange.com/questions/6157/list-of-free...</a>.<p>It's amazing that you can pretty much get up to PhD level education using these books (you should buy Landau's books, though, unfortunately those are not free).