Mike - I only just listened to this podcast, and I have to disagree with you on methods of carrying a speedloader. I carry a revolver daily and shoot one in IDPA and USPSA.
A pocket is a bad place to carry a speedloader for the same reason it's a bad place to carry a magazine. There's likely to be other stuff in that pocket, and that other stuff can get stuck in the spare ammo, somewhat slowing down the reload.
Lint doesn't mess up a speedloader the way it can a magazine, but it doesn't help, either.
You can carry a speedloader on a belt without it looking like a goiter. Just like a holster, how well it conceals depends what you're carrying the speedloader in. Several companies offer speedloader carriers that carry the speedloader with three rounds on each side of the belt; Safariland, Don Hume, and Blade-Tech are among them. When carried like this, they stick out less than a double-stack magazine. My choice, for both carry and IDPA competition, is the Blade-Tech version that holds two speedloaders. It's carried directly in front of the holster, and conceals well under the pseudo-Hawaiian square-bottomed shirts I get from Wal-Mart and other cheap places.
Two speedloaders? Sure - I'm a strong believer in the concept that you can only carry too much spare ammo if you're swimming.