I'm writing this to serve as a semi-permenant resource for those of you who often say you're "waiting for the podcast to show up on iTunes." If you're one of those people, chances are you're DOING IT WRONG.
After the podcast goes up, we update the RSS feed that points to our podcast immediately. Automatically, even! If you're subscribed to our podcast in iTunes, your computer hits our servers when you right-click on the podcast and select "update podcast" from the menu and IMMEDIATELY starts downloading the new installment.
Do NOT go to the store page in the podcast directory, search for Giant Bombcast, and listen to it there. The feed on that page is current as of whenever Apple decided to look at our feed last, which isn't automatic and sometimes takes a day or more to update. Or, at least, don't do that if you're planning on staying up to date with what we're doing, because it's an awful way to do that.
Troubleshooting: In some cases, your copy of our RSS feed might get cached by iTunes or your podcasting downloader of choice. Later versions of iTunes don't seem to have this problem, but if you "update podcast" and nothing new comes down (and you're sure that there's a new one out there that you don't have), you may need to quit the software and relaunch it. Failing that, maybe reboot? But I doubt that happens much anymore. Like I said, it hasn't happened to me in iTunes for at least a year.
Thank you and good podcasting, GLHB, HAND, and all of that.