Allan, a question about that: When a command runs, does it spawn a new OS
process or does it run in a thread within the TextMate process? It seems
that if you're running any command that starts with a shebang (#!) line
you'd have to fork a new process to load the specified command
interpreter. If that's so, then it's *way* too much CPU and disk overhead
to do every time you hit space!

I think you may be over-estimating the cost of forking. I just did a little test, and my G4 Powerbook can spawn and reap 90,000 processes per second. Your computer is probably faster than mine, and I wonder how many times you press space every second. :-)

Robin