So, below I have a list of various resources I'm using in my own little program of self-education. The text I used when studying physics as an undergraduate was the sixth edition of Halliday, Resnick, and Walker's Fundamentals of Physics. Since then, I've purchased two Dover books to help with the basics: Menzel's Mathematical Physics and Byron and Fuller's Mathematics of Classical and Quantum Physics. Both are good books; and the latter has a nice section on Green functions for those interested in quantum physics.

The chemistry text I used when I took chemistry was the third edition of McMurry and Fay's Chemistry. It goes over basic chemistry, and uses approximations to avoid any and all calculus.

As for biology, when I took it, I used the sixth edition of Biology: Life on Earth, by Teresa and Gerald Audesirk, and Bruce Byers. It covered the basics pretty well, but for people interested in the current state of biology, there is one notable exclusion I'm aware of: it makes no mention, even in passing, of Daniel Koshland's induced fit model of enzymes. As for supplemental material, I have a fifth-edition copy of Neil Carlson's Foundations of Physical Psychology, which describes various biological systems in relation to the nervous system.

As for geology, I have recently purchased an eighth-edition copy of Plummer, McGeary and Carlson's Physical Geology from a library book sale, and have not had a chance to look at it, so I have no idea how good it is. But I imagine that it, like other books listed above, should be good for a basic introduction to the subject, and little beyond that.

As for websites, my main resource for the physical sciences is the OpenCourseWare Consortium; more specifically, MIT's OpenCourseWare page. For the more biology-oriented, I must warn that I have noted many images in the lecture notes at the MIT OpenCourseWare page are left out for copywrite reasons.
For those who don't mind a bit of unpredictability in topics covered, and have no problem with a bunch of talk about the politics of science education, I recommend The Panda's Thumb. Though primarily a blog dedicated to defending science education against the Intelligent Design movement, and even then primarily focusing on ID's presence in America, every so often there is a post or a comment providing a nice clarification of biological principles. A warning is due, however: flame wars are frequent, and can get quite heated.
Finally, a pairing I find particularly useful is Wikipedia and Google Books/Scholar. It goes without saying that I do not advocate accepting what is written on Wikipedia on its own merits. However, many of the Wikipedia articles on famous scientists end with a list of external links, some of which lead to an Internet archive of the individual's work; as well as a list of titles of the individual's biggest works, which can be searched for in Google Books or Google Scholar, or failing that, just Google. And especially in physics, many of those documents are public domain! However, it is not necessarily better to read the scientist's original work, a great example of this being Einstein's work on general relativity. For one thing, many textbooks on general relativity come complete with a chapter on Lorentzian manifolds, the mathematical objects which are the natural environment of general relativity. As well, it is often times important to be familiar with the historical context of the papers. For example, a book written by the geneticist Thomas Hunt Morgan, entitled A Critique of the Theory of Evolution, describes the approaches to explain evolution that came before Darwin's historical text, starting at page 27. This text is public domain, and is available at Google Books. (Note that Google does warn that one should not assume that "just because we believe a book a book is in public domain for users in the United States, that the work is also in the public domain for users in other countries." However, since Morgan was American working at US universities, I figure US copyright law is most applicable here; granted, I am not a lawyer.)

So that is a list of resources I'm using. If you have any you like in particular, please feel free to share.