Ask HN: Which O'Reilly books do you like and own?

The O'Reilly series offer a great number of titles to choose from. And I would guess that it is the favorite publishing house of many of us here. I personally own a few books myself:

Make series:

    1.)  Electronics

    2.)  Making things talk

Nutshell series:

    3.)  Linux

    4.) Python

Pocket Reference series:

    5.) Linux

    6.) HTML & XHTML

Which titles do you own? Which ones are you thinking of getting? Of course it would be also interesting to have some other posts on other popular publishing houses such as Apress