@Jane – I'd follow one of the download links above and get the Voltaic demo, you can try it with a small clip and see if it works. I haven't heard any more from John above so I'm not sure if his problems were resolved or not.
I'd recommend trying the demo version, if you have any problems get in touch with the Voltaic developers as they'll be keen to help you resolve problems with the software.
I know there's a new release of Voltaic due out soon too, also the Voltaic webpage does list the Panasonic HDC-SD100 as compatible. Hope you get it working!