Hutch's home page
MASM32 download page and a lot of source codes.

Iczelion's Win32 Assembly Homepage
Excellent MASM32 tutorials.

NaN's and Thomas' homepage
Jaymeson Trudgen and Thomas Bleeker are authors of one of the first OOP models for MASM.

Japheth's homepage
Japheth's homepage is one of the best COM asm source webpages.

Ketil Olsen's RadASM homepage
RadASM is one of the most widespread assembler IDEs.

VKim homepage
Vkim's VKDebug is a very helpful debug tool.

Win32ASM Community
Win32ASM Community messageboard.

Masm Forum
A forum for assembler language programmers.