I've been meaning to solidify my memory of common x86 instructions for a while, but I never got around to it because I get distracted by the bazillion other more advanced instructions. This guide is nice because it covers a few common instructions in a complete-enough manner but not excruciating details like the Intel manual.
Unless you're looking at handwritten and/or deliberately obfuscated code, the "more advanced" instructions are unlikely to be encountered; the bulk of compiler-generated general-purpose code will be moves, ALU ops, pushes, and pops along with the usual control flow calls, returns, and jumps.
I deal with a lot of manual SIMD code in C with <nmmintrin.h> etc, but being a C programmer, I've forgotten how some of the "normal" instructions work. Also the advanced instructions are useful to at least be familiar with when you're working with disassembly, or studying how compilers optimize code.
