They are constant. It's the same ID that appears in the URL on the developer portal when updating a channel. It's also the same ID that appears in the URL when browsing the web channel store.
My Channels: http://roku.permanence.com - Twitter: @TheEndlessDev
Instant Watch Browser (NetflixIWB), Aquarium Screensaver (AQUARIUM), Clever Clocks Screensaver (CLEVERCLOCKS), iTunes Podcasts (ITPC), My Channels (MYCHANNELS)
