This plugin will allow you to easily insert panoramic pictures inside your posts using one of the best free java viewers available: PTViewer. Just insert a quicktag specifying the image and information about the panorama (field of view, image size, horizon position) and the plugin will compute the corresponding obscure applet parameters (in particular for partial panoramas covering less than 360 degrees of field of view).
All the instructions for installation, the support forums, a FAQ, etc. can be found on the plugin home page.
This plugin is available under the GPL license, which means that it’s free. If you use it for a commercial web site, if you appreciate my efforts or if you want to encourage me to develop and maintain it, please consider making a donation using Paypal, a secured payment solution. You just need to click the button on the plugin home page and follow the instructions.