I've had one particularly scrupulous person ask whether reprinting things that I've written on Slashdot is acceptable. I consider any content I've written freshly for Slashdot to be public domain -- it'd be nice (though not a requirement) for you to attribute me (as 0x0d0a on Slashdot). You can use what I've written here however you'd like.
There is one caveat that you should consider: If I'm quoting something that has previously been written elsewhere, by someone else (or me), I can't necessarily place that into the public domain. If I use a snippit of source code from the Linux kernel, obviously I can't simply put it in the public domain. Other than that, have fun with it!