I've recieved very positive feedback on my module. Many users are also asking me if this module will be included in the standard library. That is, of course, my wish as well.
So, can the subprocess module be accepted? If not, what needs to be done?
FWIW, I've given Peter some feedback, but in general I think this code is ready for inclusion into 2.4. I hope it's not too late. (My recommendation on the call/callv issue is to get rid of callv(), and instead let call() interpret multiple string args as such; a single string arg will be interpreted as a whole command line, per Popen(); if you want a single file arg you have to enclose it in [...].)