Links

Everybody has 'em, everybody loves 'em.  Links.  It's what's for dinner.

Computer Science

William Stalling's Computer Science Resource Site Good reference site from one of the masters.  This page begat the link to the cheat sheet (below).  Check out the HowTo section.  Links to Dr. Alan Sherman's site, also.
Theoretical Computer Science Cheat Sheet, v2.02
10 pages in PDF format of series, definitions, calculus, and more, from Dr. Steven Seiden.  This is the recent version from Stalling's Site.
Dr. Alan Sherman's Homework Info
Links to how to solve/write up homework, writing technical reports, and more. (PDF versions are on Stallings' site)  Note, the cheat sheet on Stallings' site is more recent.
Help on LaTeX

LaTeX Homework Template
LaTeX reference manual.

Homework template from Dr. Alan Sherman.  Note: a recent version of LaTeX complains about it.

Programming

C++ for you
Helpful C++ resource, forums and tips for C++ programmers, especially beginners. Includes example Programs in C++(STL, Data Structures, Numerical and algorithms) Links to free and commercial C++ compilers and tutorials.
Debugging with GDB
Online manual of a popular debugger.
GNU IOStream Library (C++)

C++ STL Reference
C++ info.
Basic Use of POSIX Threads

POSIX Threads Explained

POSIX Threads Programming
POSIX threads.
HTML Quick Reference
HTML quick reference card

Standards

RFC Sourcebook
Access to all RFC's, but also groups them by protocol, and more.

Miscellany

Internet Acronyms
If you're thinking, "BAIK," then IIRC TPTB created a dictionary of all these terms so you can look them up.  (IUD). 
HTML Tutorial
This is an excellent reference. I cannot praise it highly enough. It has an interactive feature where you can try out html code and see the results immediately, then cut/paste the code to your web page.