I've written a lot of ARM assembler, and I think that could be described as a delight to program. An orthogonal instruction set, consistent naming, conditionals on every instruction, and a decent number of registers make it really quite pleasant (as these things go).

These days I'm writing a lot of code in Ruby and JavaScript on the JVM, and find myself considering Java my current equivalent of assembly. It's sad really, being so far away from what the CPU is actually executing.