A few suggestions, including some for fields you didn't specify. I hope these aren't too infantile for you, as you seem to think at a fairly high level.

General Chemistry-
Principles of Modern Chemistry by Oxtoby and Nachtrieb

Immunology-
Immunobiology by Charles Janeway (recently deceased)

Genetics-
Hartl and Jones wasn't bad, but it was most appropriate for my course because Hartl taught it. There's also Hartl's Essential Genetics, a shorter version.

Microeconomics -
1)Mankiw - basic intro text
2)Microeconomic Theory: Basic Principles and Extensions by Walter Nicholson. This is an intermediate-level text requiring knowledge of multivariable calculus
3)Game Theory with Economic Applications by Bierman and Fernandez

Organic Chemistry-
Loudon

Statistics-
Moore and McCabe is a very, very basic intro text.

Arthur Holmes's 'Principles of Physical Geology' is one of the most interesting books I ever read.

Begon, Harper and Townsend's 'Ecology' is also very good.

I have never yet found a good introduction to statistics - they are all either too advanced or too babyish. Bulmer's 'Principles of Statistics' started well, but my eyes glazed over when he got onto moment-generating-functions!

i can second principles of modern chemistry. was pretty intro.

Razib,

By failing to list Andrew Clark as a co-author, your post leaves a certain ambiguity - it is unclear whether it was Hartl and Clark's "Principles of Population Genetics" you read, or just Hartl's "A Primer of Population Genetics".

I expect it was the former, as reading the latter hardly counts as an impressive achievement.

As far as I know, there's no introductory textbook of philosophy. I would recommend Stephen Toulmin's "Cosmopolis" and Rorty's "Philosophy and the Mirror of Nature", however. They will convince you not to waste your time with analytic philsophy. Toulmin's is an extraordinarily good book.

i added andrew clark-i don't think hartl & clark's work is "impressive" in terms of being too technical to read. if you've never read pop genetics before i assume that 3-4 read-throughs would allow you internalize most of the general principles.... (to be fair, i had some undergraduate population genetics background-so i didn't come into as a neophyte)

re economics - agree with the Mankiw, also Stiglitz. but also see Hal Varian's intermediate, very first principle algebra approach and quite good. But do also read economic classics like Marshall's Principles which is available online

for philosophy see Scruton's Modern Philosophy.

For programming I'd suggest How to Design Programs. Full html text for free at that URL, dead tree by MIT Press linked to from there too.

It's written for non-programmers, and uses Scheme as it's programming language. It's a gentler intro to programming in general that Learning Perl, and has more foundational theory to boot, from a practical perspective (WHY would you do things in a certain way, etc. A nice grounding in abstractions as actually applied).

For Discrete Math I'd recomment Rosen,
Katsuhiko Ogata for Control Systems,
George Stephanopoulos for Chemical Process Control, Oppenheim and Willsky for Signals and Systems & Millman and Halkius for Electronic Circuits.

There's also the sublime compendium of a whole range of Math problems from the elementary to the Olympiad level titled "Selected Problems and Theorems in Elementary
Mathematics" written by Shklyarsky, Chentsov and Yaglom.