A bunch of us got together and with a lot of work from Keith Martin, we gathered as many panorama viewers as we could think of and loaded them up with the same image so that a visual, side by side comparison could be made.

We hope that it will be useful in giving people who are trying to decide which panorama viewer (and there's a bunch) would be the best match for the purpose intended.

Take a look at:

http://www.panoramaphotographer.com/comparisons/web/

It's mostly done but will be slowly evolving over the next few weeks/months.