If you're thinking of getting either of these mics, jump to about half way through the video where there's samples of the Broadcaster and Procaster recorded in a radio station's studio. Unfortunately, the Podcaster - which they do say performs the same way as the Procaster - is then demoed in a completely different environment, making it difficult to compare with the other two.
Sound wise; I liked the sound of the Broadcaster better than the Procaster; it sounded a bit brighter and clearer to my ears. Whether it's worth the extra $200 is debatable.
A note about USB mics: I have a Samson USB mic (which coast about half the cost of the Podcaster, so I'm not saying it's as good) and frankly while it doesn't require the extra USB I/O box that regular mics require, I don't find it any easier to manage and work with when connected to the computer. I seem to have more driver issues with the USB mic. But using one means there's one less piece of gear to drag about, which is useful if you're going on-location, but not so much if you only record at home.