"Ressource temporarily not available" -- if you've ever been confronted with this message on Mac OS X and found that a particular program would no longer be able to run until you restarted, you've probably reached the limit of simultaneously allowed processes. The default for Mac OS XS is set to 100, which probably should be enough for the majority of users out there, but for a developer this limit can easily be reached in the course of his or her normal work. What to do? Well, Phillip Moore has the answer:

create /etc/launchd.conf file if it does not already exist and add the following line:

limit maxproc 512 2048

You will need to reboot for the change to take effect, but after that you'll probably never run into this problem again...