Hi,
I managed to find an FZ20 on sale in the US last summer on holiday ($270), and promptly had a lot of fun with it in North Carolina & Utah mountains. I managed to take quite a few photo's that I'm happy with (not up to the standard of many here, but that's me rather than the camera).
Then in November, I bought myself the Raynox 2.2x teleconverter. So far, I haven't taken a single picture with it that justifies my investment: the softness of the result means that I am at least as good off cropping a photo without the extra lens. I've tried using a monopod, but I think that basically the problem is that I live in Holland. And its winter. I've seen the sun once in 2006. I definitely agree with previous comments about this being a camera for bright conditions.