These are the links which I find most useful for information which is relevent to code injection matters. Some of those sites which don't contain much information on adding functionality are still useful in explaining methods of finding out what pieces of code are executed when you pressed a certain button etc. This knowledge will help greatly in understanding the working of the program you are running.

Reverse Code Engineering Links

Here is a small sample of the best sites to visit for information on reverse code engineering on the internet. Many good sites have not been listed here because they are linked to already through most of these site:

Immortal Descendants: An excellent site containing lots of essays and lessons in programming. Recommended

+Sandman's Page: Another excellent site containing a vast array of essays + java script reversing. Recommended

+Fravia's Old Site: Last remaining mirror of +Fravia's Pages of Reverse Engineering updated by +Tsehp. Legendary

CrackZ's Reverse Engineering Page for the Millennium: Huge site. Lots of tutorials and lots of Dongle Info. Recommended

Reverser's Links: I can't be arsed writing loads of links so use this page instead. Not well maintained, alot of dead links

Tools Sites

This is a list of the best tools sites on the internet for our purposes. You probably won't need to visit any others except for the rare tools which may not be listed here:

Programmer's Tools: Probably the best tools site in the reversing community. Highly recommended

Sudden Discharge: One of the oldest and most comprehensive tools sites. Recently re-designed. Recommended

Crackpl Tools: Yet another large tools site. Updated as regulary as the to above and probably just as good

Player's Reverse Engineering Tools: Good tools site. Updated quite regularly

Win32Asm Sites

Only two sites listed here because there the only sites you'll ever need to learn win32asm:

Iczelion's Win32 Assembly Homepage: The most comprehensive win32asm site on the internet. Very highly recommended

Hutch's Masm Homepage: This is where you can download the latest version of Masm as maintained by Hutch

Message Boards

These are where you should go to ask for help:

Fravia's Message Boards: Not really Fravia's as that was taken down but here are four different message boards where you should ask for help if you have any question about code injection (or other reversing questions)

Iczelion's W32Asm Message Board: Ask any Win32Asm questions here