This would be very useful; I've written some OpenCL code (called from Python, but I coded the Kernel and set up the buffers in C myself) and it's full of pitfal

This would be very useful; I've written some OpenCL code (called from Python, but I coded the Kernel and set up the buffers in C myself) and it's full of pitfalls; much harder than just "here's an array, here's a procedure. run it in parallel for me." I beleive there are already ways to do this (IIRC, F#'s original demo showed off trivially parallelisible functions), but a simple interface (i.e. something that looks like a high level language with a REPL etc) is key. As someone who's generally excited about anything that makes you write Scheme, or anything that integrates with Python, I'll be keeping an eye on Harlan!