Removing vocal popping in GarageBand

If there aren't too many of them you could lower the volume in GarageBand. It would keep you from normalizing down the volume of the entire podcast if you looked at the waveform and set volume decreases for that track in the Track Volume bar that you access by clicking the arrow.
Or if you know approximately what frequency they are at you could put an EQ on the master track and cut that frequency.

Daniel

Best thing to do is to use a screen in front of the microphone.

You can take a small hoop or a wire and use some old nylon stockings to place in the hoop to make a screen. This will help with the P's and B's

What I do is open the sound file in an audio editor (like SoundStudio). The pops are visible as spikes that reach the maximum volume (actually they exceeded it and clipped). I mark those sounds as precisely as possible and lower the volume (using the Normalize feature) so that they don't exceed the general level of the recording, maybe even less. That doesn't change the popping character of those sounds, but it makes it a lot less audible.

"Remove" not really. Prevent, yes. This CAD EPF-15A 6-Inch Flexible Pop Filter for $20 would work wonders (I never do vocals without one)