Day-to-day I don't think much about multi-core programming, but it's always on my radar.
The biggest problem I've always had with parallel processing is determing what should be parallelized? It's easy to spin-off a thread to background process a file, but can the file processing itself be parallelized?
I think the questions of what can and should be parallelized are answered with complex architectural decisions layered on top of the already complex architectural decisions of the application in general. My belief is that this complexity will be solved either by the OS or by the programming language. The traditional thread model of parallelization found in C and its descendants is not the final answer.
