Just finished customizing this component and I am amazed with it. I first found it on www.flashxml.net/panorama-viewer.html and when I saw that there is no review here I thought I might share my experience with the world.
The name is Panorama Viewer FX and this little component is the most versatile panorama viewer I have come across. I use it to showcase my panorama images that I took/stitched with my camera.
Everything is XML driven, so there's no need for Flash editing. But when I mean that everything is XML driven, I mean everything - the component has around 130 different customizable properties, controlling everything from size (width/height), scroll speeds, animation behaviors, colors, background, colors and many more. This can actually be something of a drawback - there are so many customizable properties that it's hard at first to know where to start.
That's where their page's Live demo comes into action, allowing me to customize the component on the fly.
It allows you to add multiple panoramas, with text descriptions, in the panorama selector, and in the panorama main window.
I really liked the hotspots you can add to your Panorama, little pop-up windows showing extra information about that point on the panorama.