One of the best ways so far to view my spherical panoramas is with a free iMove viewer, either plug-in or standalone for Macintosh or PC. With the standalone viewer, you can resize the window. See also Java applets.
Innovative QTVR from Deep Forest Multimedia by Bill Meikle. http://www.vrhotwires.com/.
I use VRHotWires.
Two free Zoom viewers from http://www.mgisoft.com/ let you view spheres. The Java applet requires no plug-in. The other viewer has Mac and PC browser plug-ins. The PC plug-in displays the image in-line, on the page. The Mac plug-in pops up a separate application window.
http://www.vrtools.com/. conVRter is a good, affordable way to do hot spots and much more. Also deliVRator, from VRtools by Jon Summers.
I won mapsaVR from Squamish Media Group and use it in several panos to show compass point directions interactively. They have other useful tools, including soundsaVR and revolVR. See http://www.smgVR.com.
About IPIX. As of March, 2000, my attitude is live and let live.