Free Assembly Tutorials
This is an open content wiki book about assembly language programming. The book includes sections on the history of the X86 architecture, the X86 family and programming in X86 assembly.
This is the wikibooks entry for MIPS assembly that discusses the MIPS architecture and MIPS programming.
Programmed Introduction to MIPS Assembly Language
This is a course in assembly language programming of the MIPS processor. It emphasizes the topics needed for study of computer architecture: bits, bit patterns, operations on bit patterns, and how bit patterns represent instructions and data.
Win32 Assembler Coding Tutorial
This site also has some additional assembler and programming resources that you can access from the drop down menus at the top of the page.
Programming from the Ground Up (1.4 Mb PDF file)
A book on assembly for the newbie to the pro. It covers how the cpu works as well as writting programs.
Introduction to Assembly Language
This web page examines assembly languages in a general manner. Specific examples of addressing modes and instructions from various processors are used to illustrate the general nature of assembly language.
Assembly Language Tutor
This is an introduction for people who want to program in assembler language.
The Art of Assembly Language Programming
Online book available for Windows, DOS and Linux assembly programming. Teaches High Level Assembly (HLA) - you will need to download the HLA compiler and supporting files.
PC Assembly Tutorial
The tutorial has extensive coverage of interfacing assembly and C code and so might be of interest to C programmers who want to learn about how C works under the hood. All the examples use the free NASM (Netwide) assembler.
If you are looking for information on assembly programming under UNIX-like operating systems, this is the right place to be. Here you can find various resources, ranging from tutorials and documentation, to actual programs written in assembly language.