I've started working on some guides to x86-64 assembly language programming on Linux. They started as my own personal notes, then started to look a bit like a short crash course, then more like proper guides. They target people who already have some experience with programming but want to learn a bit of assembly. They're heavy on examples and line-by-line explanations, since that's the way I learn and explain things best.
I have rough drafts of about 10 or so sections (depending on how the content is divided). As sections become ready I'll be publishing them here. When/if the entire guide is completed I'll probably combine the sections into a single PDF or something like that.
The table of contents is available here.
If you have comments, suggestions, or corrections, they'd be very welcome. I can be found on freenode as the user briansteffens.